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Western Theories of Justice

Justice is one of the most important moral and political concepts. The word comes from the Latin jus, meaning right or law. The Oxford English Dictionary defines the just person as one who typically does what is morally right and is disposed to giving everyone his or her due, offering the word fair as a synonym. But philosophers want to get beyond etymology and dictionary definitions to consider, for example, the nature of justice as both a moral virtue of character and a desirable quality of political society, as well as how it applies to ethical and social decision-making. This article will focus on Western philosophical conceptions of justice. These will be the greatest theories of ancient Greece (those of Plato and Aristotle) and of medieval Christianity (Augustine and Aquinas), two early modern ones (Hobbes and Hume), two from more recent modern times (Kant and Mill), and some contemporary ones (Rawls and several successors). Typically the article considers not only their theories of justice but also how philosophers apply their own theories to controversial social issuesfor example, to civil disobedience, punishment, equal opportunity for women, slavery, war, property rights, and international relations.

For Plato, justice is a virtue establishing rational order, with each part performing its appropriate role and not interfering with the proper functioning of other parts. Aristotle says justice consists in what is lawful and fair, with fairness involving equitable distributions and the correction of what is inequitable. For Augustine, the cardinal virtue of justice requires that we try to give all people their due; for Aquinas, justice is that rational mean between opposite sorts of injustice, involving proportional distributions and reciprocal transactions. Hobbes believed justice is an artificial virtue, necessary for civil society, a function of the voluntary agreements of the social contract; for Hume, justice essentially serves public utility by protecting property (broadly understood). For Kant, it is a virtue whereby we respect others freedom, autonomy, and dignity by not interfering with their voluntary actions, so long as those do not violate others rights; Mill said justice is a collective name for the most important social utilities, which are conducive to fostering and protecting human liberty. Rawls analyzed justice in terms of maximum equal liberty regarding basic rights and duties for all members of society, with socio-economic inequalities requiring moral justification in terms of equal opportunity and beneficial results for all; and various post-Rawlsian philosophers develop alternative conceptions.

Western philosophers generally regard justice as the most fundamental of all virtues for ordering interpersonal relations and establishing and maintaining a stable political society. By tracking the historical interplay of these theories, what will be advocated is a developing understanding of justice in terms of respecting persons as free, rational agents. One may disagree about the nature, basis, and legitimate application of justice, but this is its core.

1. Ancient Greece

For all their originality, even Platos and Aristotles philosophies did not emerge in a vacuum. As far back in ancient Greek literature as Homer, the concept of dikaion, used to describe a just person, was important. From this emerged the general concept of dikaiosune, or justice, as a virtue that might be applied to a political society. The issue of what does and does not qualify as just could logically lead to controversy regarding the origin of justice, as well as that concerning its essence. Perhaps an effective aid to appreciating the power of their thought is to view it in the context of the teachings of the Sophists, those itinerant teachers of fifth-century ancient Greece who tried to pass themselves off as wise men. In his trial, Socrates was at pains to dissociate himself from them, after his conviction refusing to save himself, as a typical Sophist would, by employing an act of civil disobedience to escape (Dialogues, pp. 24-26, 52-56; 18b-19d, 50a-54b); Plato is more responsible than anyone else for giving them the bad name that sticks with them to this present time; and Aristotle follows him in having little use for them as instructors of rhetoric, philosophy, values, and the keys to success. So what did these three great philosophers (literally lovers of wisdom) find so ideologically objectionable about the Sophists? The brief answer is, their relativism and their skepticism. The first important one, Protagoras, captures the former with his famous saying, Man is the measure of all thingsof the things that are, that they are, and of the things that are not, that they are not; and he speaks to the latter with a declaration of agnosticism regarding the existence of divinities. Gorgias (Plato named dialogues after both of them) is remembered for a striking three-part statement of skepticism, holding that nothing really exists, that, even if something did exist, we could not grasp it, and that, even if we could grasp something real, we could never express it to anyone else. If all values are subjective and/or unknowable, then what counts as just gets reduced to a matter of shifting opinion. We can easily anticipate how readily Sophists would apply such relativism and skepticism to justice. For example, Thrasymachus (who figures into the first book of Platos Republic) is supposed to have said that there must not be any gods who care about us humans because, while justice is our greatest good, men commonly get away with injustice. But the most significant Sophist statement regarding justice arguably comes from Antiphon, who employs the characteristic distinction between custom (nomos) and nature (physis) with devastating effect. He claims that the laws of justice, matters of convention, should be obeyed when other people are observing us and may hold us accountable; but, otherwise, we should follow the demands of nature. The laws of justice, extrinsically derived, presumably involve serving the good of others, the demands of nature, which are internal, serving self-interest. He even suggests that obeying the laws of justice often renders us helpless victims of those who do not (First, pp. 211, 232, 274, 264-266). If there is any such objective value as natural justice, then it is reasonable for us to attempt a rational understanding of it. On the other hand, if justice is merely a construction of customary agreement, then such a quest is doomed to frustration and failure. With this as a backdrop, we should be able to see what motivated Plato and Aristotle to seek a strong alternative.

a. Plato

Platos masterful Republic (to which we have already referred) is most obviously a careful analysis of justice, although the book is far more wide-ranging than that would suggest. Socrates, Platos teacher and primary spokesman in the dialogue, gets critically involved in a discussion of that very issue with three interlocutors early on. Socrates provokes Cephalus to say something which he spins into the view that justice simply boils down to always telling the truth and repaying ones debts. Socrates easily demolishes this simplistic view with the effective logical technique of a counter-example: if a friend lends you weapons, when he is sane, but then wants them back to do great harm with them, because he has become insane, surely you should not return them at that time and should even lie to him, if necessary to prevent great harm. Secondly, Polemarchus, the son of Cephalus, jumps into the discussion, espousing the familiar, traditional view that justice is all about giving people what is their due. But the problem with this bromide is that of determining who deserves what. Polemarchus may reflect the cultural influence of the Sophists, in specifying that it depends on whether people are our friends, deserving good from us, or foes, deserving harm. It takes more effort for Socrates to destroy this conventional theory, but he proceeds in stages: (1) we are all fallible regarding who are true friends, as opposed to true enemies, so that appearance versus reality makes it difficult to say how we should treat people; (2) it seems at least as significant whether people are good or bad as whether they are our friends or our foes; and (3) it is not at all clear that justice should excuse, let alone require, our deliberately harming anyone (Republic, pp. 5-11; 331b-335e). If the first inadequate theory of justice was too simplistic, this second one was downright dangerous.

The third, and final, inadequate account presented here is that of the Sophist Thrasymachus. He roars into the discussion, expressing his contempt for all the poppycock produced thus far and boldly asserting that justice is relative to whatever is advantageous to the stronger people (what we sometimes call the might makes right theory). But who are the stronger people? Thrasymachus cannot mean physically stronger, for then inferior humans would be superior to finer folks like them. He clarifies his idea that he is referring to politically powerful people in leadership positions. But, next, even the strongest leaders are sometimes mistaken about what is to their own advantage, raising the question of whether people ought to do what leaders suppose is to their own advantage or only what actually is so. (Had Thrasymachus phrased this in terms of what serves the interest of society itself, the same appearance versus reality distinction would apply.) But, beyond this, Socrates rejects the exploitation model of leadership, which sees political superiors as properly exploiting inferiors (Thrasymachus uses the example of a shepherd fattening up and protecting his flock of sheep for his own selfish gain), substituting a service model in its place (his example is of the good medical doctor, who practices his craft primarily for the welfare of patients). So, now, if anything like this is to be accepted as our model for interpersonal relations, then Thrasymachus embraces the injustice of self-interest as better than serving the interests of others in the name of justice. Well, then, how are we to interpret whether the life of justice or that of injustice is better? Socrates suggests three criteria for judgment: which is the smarter, which is the more secure, and which is the happier way of life; he argues that the just life is better on all three counts. Thus, by the end of the first book, it looks as if Socrates has trounced all three of these inadequate views of justice, although he himself claims to be dissatisfied because we have only shown what justice is not, with no persuasive account of its actual nature (ibid., pp. 14-21, 25-31; 338c-345b, 349c-354c). Likewise, in Gorgias, Plato has Callicles espouse the view that, whatever conventions might seem to dictate, natural justice dictates that superior people should rule over and derive greater benefits than inferior people, that society artificially levels people because of a bias in favor of equality. Socrates is then made to criticize this theory by analyzing what sort of superiority would be relevant and then arguing that Callicles is erroneously advocating injustice, a false value, rather than the genuine one of true justice (Gorgias, pp. 52-66; 482d-493c; see, also, Laws, pp. 100-101, 172; 663, 714 for another articulation of something like Thrasymachus position).

In the second book of Platos Republic, his brothers, Glaucon and Adeimantus, take over the role of primary interlocutors. They quickly make it clear that they are not satisfied with Socrates defense of justice. Glaucon reminds us that there are three different sorts of goodsintrinsic ones, such as joy, merely instrumental ones, such as money-making, and ones that are both instrumentally and intrinsically valuable, such as healthin order to ask which type of good is justice. Socrates responds that justice belongs in the third category, rendering it the richest sort of good. In that case, Glaucon protests, Socrates has failed to prove his point. If his debate with Thrasymachus accomplished anything at all, it nevertheless did not establish any intrinsic value in justice. So Glaucon will play devils advocate and resurrect the Sophist position, in order to challenge Socrates to refute it in its strongest form. He proposes to do this in three steps: first, he will argue that justice is merely a conventional compromise (between harming others with impunity and being their helpless victims), agreed to by people for their own selfish good and socially enforced (this is a crude version of what will later become the social contract theory of justice in Hobbes); second, he illustrates our allegedly natural selfish preference for being unjust if we can get away with it by the haunting story of the ring of Gyges, which provides its wearer with the power to become invisible at will and, thus, to get away with the most wicked of injusticesto which temptation everyone would, sooner or later, rationally succumb; and, third, he tries to show that it is better to live unjustly than justly if one can by contrasting the unjust person whom everyone thinks just with the just person who is thought to be unjust, claiming that, of course, it would be better to be the former than the latter. Almost as soon as Glaucon finishes, his brother Adeimantus jumps in to add two more points to the case against justice: first, parents instruct their children to behave justly not because it is good in itself but merely because it tends to pay off for them; and, secondly, religious teachings are ineffective in encouraging us to avoid injustice because the gods will punish it and to pursue justice because the gods will reward it, since the gods may not even exist or, if they do, they may well not care about us or, if they are concerned about human behavior, they can be flattered with prayers and bribed with sacrifices to let us get away with wrongdoing (Republic, pp. 33-42; 357b-366e). So the challenge for Socrates posed by Platos brothers is to show the true nature of justice and that it is intrinsically valuable rather than only desirable for its contingent consequences.

In defending justice against this Sophist critique, Plato has Socrates construct his own positive theory. This is set up by means of an analogy comparing justice, on the large scale, as it applies to society, and on a smaller scale, as it applies to an individual soul. Thus justice is seen as an essential virtue of both a good political state and a good personal character. The strategy hinges on the idea that the state is like the individual writ largeeach comprising three main parts such that it is crucial how they are interrelatedand that analyzing justice on the large scale will facilitate our doing so on the smaller one. In Book IV, after cobbling together his blueprint of the ideal republic, Socrates asks Glaucon where justice is to be found, but they agree they will have to search for it together. They agree that, if they have succeeded in establishing the foundations of a completely good society, it would have to comprise four pivotal virtues: wisdom, courage, temperance, and justice. If they can properly identify the other three of those four, whatever remains that is essential to a completely good society must be justice. Wisdom is held to be prudent judgment among leaders; courage is the quality in defenders or protectors whereby they remain steadfast in their convictions and commitments in the face of fear; and temperance (or moderation) is the virtue to be found in all three classes of citizens, but especially in the producers, allowing them all to agree harmoniously that the leaders should lead and everyone else follow. So now, by this process-of-elimination analysis, whatever is left that is essential to a completely good society will allegedly be justice. It then turns out that justice is doing ones own work and not meddling with what isnt ones own. So the positive side of socio-political justice is each person doing the tasks assigned to him or her; the negative side is not interfering with others doing their appointed tasks. Now we move from this macro-level of political society to the psychological micro-level of an individual soul, pressing the analogy mentioned above. Plato has Socrates present an argument designed to show that reason in the soul, corresponding to the leaders or guardians of the state, is different from both the appetites, corresponding to the productive class, and the spirited part of the soul, corresponding to the states defenders or auxiliaries and that the appetites are different from spirit. Having established the parallel between the three classes of the state and the three parts of the soul, the analogy suggests that a completely good soul would also have to have the same four pivotal virtues. A good soul is wise, in having good judgment whereby reason rules; it is courageous in that its spirited part is ready, willing, and able to fight for its convictions in the face of fear; and it is temperate or moderate, harmoniously integrated because all of its parts, especially its dangerous appetitive desires, agree that it should be always under the command of reason. And, again, what is left that is essential is justice, whereby each part of the soul does the work intended by nature, none of them interfering with the functioning of any other parts. We are also told in passing that, corresponding to these four pivotal virtues of the moral life, there are four pivotal vices, foolishness, cowardice, self-indulgence, and injustice. One crucial question remains unanswered: can we show that justice, thus understood, is better than injustice in itself and not merely for its likely consequences? The answer is that, of course, we can because justice is the health of the soul. Just as health is intrinsically and not just instrumentally good, so is justice; injustice is a diseasebad and to be avoided even if it isnt yet having any undesirable consequences, even if nobody is aware of it (ibid., pp. 43, 102-121; 368d, 427d-445b; it can readily be inferred that this conception of justice is non-egalitarian; but, to see this point made explicitly, see Laws, pp. 229-230; 756-757).

Now let us quickly see how Plato applies this theory of justice to a particular social issue, before briefly considering the theory critically. In a remarkably progressive passage in Book V of his Republic, Plato argues for equal opportunity for women. He holds that, even though women tend to be physically weaker than men, this should not prove an insuperable barrier to their being educated for the same socio-political functions as men, including those of the top echelons of leadership responsibility. While the body has a gender, it is the soul that is virtuous or vicious. Despite their different roles in procreation, child-bearing, giving birth, and nursing babies, there is no reason, in principle, why a woman should not be as intelligent and virtuousincluding as justas men, if properly trained. As much as possible, men and women should share the workload in common (Republic, pp. 125-131; 451d-457d). We should note, however, that the rationale is the common good of the community rather than any appeal to what we might consider womens rights. Nevertheless, many of us today are sympathetic to this application of justice in support of a view that would not become popular for another two millennia.

What of Platos theory of justice itself? The negative part of ithis critique of inadequate views of justiceis a masterful series of arguments against attempts to reduce justice to a couple of simplistic rules (Cephalus), to treating people merely in accord with how we feel about them (Polemarchus), and to the power-politics mentality of exploiting them for our own selfish purposes (Thrasymachus). All of these views of a just person or society introduce the sort of relativism and/or subjectivism we have identified with the Sophists. Thus, in refuting them, Plato, in effect, is refuting the Sophists. However, after the big buildup, the positive partwhat he himself maintains justice isturns out to be a letdown. His conception of justice reduces it to order. While some objective sense of order is relevant to justice, this does not adequately capture the idea of respecting all persons, individually and collectively, as free rational agents. The analogy between the state and the soul is far too fragile to support the claim that they must agree in each having three parts. The process-of-elimination approach to determining the nature of justice only works if those four virtues exhaust the list of what is essential here. But do they? What, for example, of the Christian virtue of love or the secular virtue of benevolence? Finally, the argument from analogy, showing that justice must be intrinsically, and not merely instrumentally, valuable (because it is like the combination good of health) proves, on critical consideration, to fail. Platos theory is far more impressive than the impressionistic view of the Sophists; and it would prove extremely influential in advocating justice as an objective, disinterested value. Nevertheless, one cannot help hoping that a more cogent theory might yet be developed.

b. Aristotle

After working with Plato at his Academy for a couple of decades, Aristotle was understandably most influenced by his teacher, also adopting, for example, a virtue theory of ethics. Yet part of Aristotles greatness stems from his capacity for critical appropriation, and he became arguably Platos most able critic as well as his most famous follower in wanting to develop a credible alternative to Sophism. Book V of his great Nicomachean Ethics deals in considerable depth with the moral and political virtue of justice. It begins vacuously enough with the circular claim that it is the condition that renders us just agents inclined to desire and practice justice. But his analysis soon becomes more illuminating when he specifies it in terms of what is lawful and fair. What is in accordance with the law of a state is thought to be conducive to the common good and/or to that of its rulers. In general, citizens should obey such law in order to be just. The problem is that civil law can itself be unjust in the sense of being unfair to some, so that we need to consider special justice as a function of fairness. He analyzes this into two sorts: distributive justice involves dividing benefits and burdens fairly among members of a community, while corrective justice requires us, in some circumstances, to try to restore a fair balance in interpersonal relations where it has been lost. If a member of a community has been unfairly benefited or burdened with more or less than is deserved in the way of social distributions, then corrective justice can be required, as, for example, by a court of law. Notice that Aristotle is no more an egalitarian than Plato waswhile a sort of social reciprocity may be needed, it must be of a proportional sort rather than equal. Like all moral virtues, for Aristotle, justice is a rational mean between bad extremes. Proportional equality or equity involves the intermediate position between someones unfairly getting less than is deserved and unfairly getting more at anothers expense. The mean of justice lies between the vices of getting too much and getting too little, relative to what one deserves, these being two opposite types of injustice, one of disproportionate excess, the other of disproportionate deficiency (Nicomachean, pp. 67-74, 76; 1129a-1132b, 1134a).

Political justice, of both the lawful and the fair sort, is held to apply only to those who are citizens of a political community (a polis) by virtue of being free and either proportionately or numerically equal, those whose interpersonal relations are governed by the rule of law, for law is a prerequisite of political justice and injustice. But, since individuals tend to be selfishly biased, the law should be a product of reason rather than of particular rulers. Aristotle is prepared to distinguish between what is naturally just and unjust, on the one hand, such as whom one may legitimately kill, and what is merely conventionally just or unjust, on the other, such as a particular system of taxation for some particular society. But the Sophists are wrong to suggest that all political justice is the artificial result of legal convention and to discount all universal natural justice (ibid., pp. 77-78; 1134a-1135a; cf. Rhetoric, pp. 105-106; 1374a-b). What is allegedly at stake here is our developing a moral virtue that is essential to the well-being of society, as well as to the flourishing of any human being. Another valuable dimension of Aristotles discussion here is his treatment of the relationship between justice and decency, for sometimes following the letter of the law would violate fairness or reasonable equity. A decent person might selfishly benefit from being a stickler regarding following the law exactly but decide to take less or give more for the sake of the common good. In this way, decency can correct the limitations of the law and represents a higher form of justice (Nicomachean, pp. 83-84; 1137a-1138a).

In his Politics, Aristotle further considers political justice and its relation to equality. We can admit that the former involves the latter but must carefully specify by maintaining that justice involves equality not for everyone, only for equals. He agrees with Plato that political democracy is intrinsically unjust because, by its very nature, it tries to treat unequals as if they were equals. Justice rather requires inequality for people who are unequal. But, then, oligarchy is also intrinsically unjust insofar as it involves treating equals as unequal because of some contingent disparity, of birth, wealth, etc. Rather, those in a just political society who contribute the most to the common good will receive a larger share, because they thus exhibit more political virtue, than those who are inferior in that respect; it would be simply wrong, from the perspective of political justice, for them to receive equal shares. Thus political justice must be viewed as a function of the common good of a community. It is the attempt to specify the equality or inequality among people, he admits, that constitutes a key problem of political philosophy. He thinks we can all readily agree that political justice requires proportional rather than numerical equality. But inferiors have a vested interest in thinking that those who are equal in some respect should be equal in all respects, while superiors are biased, in the opposite direction, to imagine that those who are unequal in some way should be unequal in all ways. Thus, for instance, those who are equally citizens are not necessarily equal in political virtue, and those who are financially richer are not necessarily morally or mentally superior. What is relevant here is equality according to merit, though Aristotle cannot precisely specify what, exactly, counts as merit, for how much it must count, who is to measure it, and by what standard. All he can suggest, for example in some of his comments on the desirable aristocratic government, is that it must involve moral and intellectual virtue (Politics, pp. 79, 81, 86, 134, 136, 151, 153; 1280a, 1281a, 1282b, 1301a-1302a, 1307a, 1308a).

Let us now consider how Aristotle applies his own theory of justice to the social problem of alleged superiors and inferiors, before attempting a brief critique of that theory. While Plato accepted slavery as a legitimate social institution but argued for equal opportunity for women, in his Politics, Aristotle accepts sexual inequality while actively defending slavery. Anyone who is inferior intellectually and morally is properly socio-politically inferior in a well-ordered polis. A human being can be naturally autonomous or not, a natural slave being defective in rationality and morality, and thus naturally fit to belong to a superior; such a human can rightly be regarded as a piece of property, or another persons tool for action. Given natural human inequality, it is allegedly inappropriate that all should rule or share in ruling. Aristotle holds that some are marked as superior and fit to rule from birth, while others are inferior and marked from birth to be ruled by others. This supposedly applies not only to ethnic groups, but also to the genders, and he unequivocally asserts that males are naturally superior and females naturally inferior, the former being fit to rule and the latter to be ruled. The claim is that it is naturally better for women themselves that they be ruled by men, as it is better for natural slaves that they should be ruled by those who are naturally free. Now Aristotle does argue only for natural slavery. It was the custom (notice the distinction, used here, between custom and nature) in antiquity to make slaves of conquered enemies who become prisoners of war. But Aristotle (like Plato) believes that Greeks are born for free and rational self-rule, unlike non-Greeks (barbarians), who are naturally inferior and incapable of it. So the fact that a human being is defeated or captured is no assurance that he is fit for slavery, as an unjust war may have been imposed on a nobler society by a more primitive one. While granting that Greeks and non-Greeks, as well as men and women, are all truly human, Aristotle justifies the alleged inequality among them based on what he calls the deliberative capacity of their rational souls. The natural slaves rational soul supposedly lacks this, a woman has it but it lacks the authority for her to be autonomous, a (free male) child has it in some developmental stage, and a naturally superior free male has it developed and available for governance (ibid., pp. 7-11, 23; 1254a-1255a, 1260a).

This application creates a helpful path to a critique of Aristotles theory of justice. If we feel that it is unjust to discriminate against people merely on account of their gender and/or ethnic origin, as philosophers, we try to identify the rational root of the problem. If our moral intuitions are correct against Aristotle (and some would even call his views here sexist and racist), he may be mistaken about a matter of fact or about a value judgment or both. Surely he is wrong about all women and non-Greeks, as such, being essentially inferior to Greek males in relevant ways, for cultural history has demonstrated that, when given opportunities, women and non-Greeks have shown themselves to be significantly equal. But it appears that Aristotle may also have been wrong in leaping from the factual claim of inequality to the value judgment that it is therefore right that inferiors ought to be socially, legally, politically, and economically subordinatelike Plato and others of his culture (for which he is an apologist here), Aristotle seems to have no conception of human rights as such. Like Plato, he is arguing for an objective theory of personal and social justice as a preferable alternative to the relativistic one of the Sophists. Even though there is something attractive about Aristotles empirical (as opposed to Platos idealistic) approach to justice, it condemns him to the dubious position of needing to derive claims about how things ought to be from factual claims about the way things actually are. It also leaves Aristotle with little viable means of establishing a universal perspective that will respect the equal dignity of all humans, as such. Thus his theory, like Platos, fails adequately to respect all persons as free, rational agents. They were so focused on the ways in which people are unequal, that they could not appreciate any fundamental moral equality that might provide a platform for natural human rights.

2. Medieval Christianity

When Christian thinkers sought to develop their own philosophies in the middle ages (medieval meaning the middle ages and middle in the sense of being between antiquity and modernity), they found precious basic building-blocks in ancient thought. This included such important post-Aristotelians as the enormously influential Roman eclectic Cicero, such prominent Stoics as Marcus Aurelius (a Roman emperor) and Epictetus (a Greek slave of the Romans), and neo-Platonists like Plotinus. But the two dominant paths that medieval philosophy would follow for its roughly thousand year history had been blazed by Plato and Aristotle. More specifically, Augustine uses Platonic (and neo-Platonic) philosophy to the extent that he can reconcile it with Christian thought; Aquinas, many centuries later, develops a great synthesis of Christian thought (including that of Augustine) and Aristotelian philosophy. A great difference, however, between their philosophies and those of Hellenic thinkers such as Plato and Aristotle stems from the commitment of these Christians to the authority of the Hebrew and Christian scriptures. Aquinas would later agree with Augustine (who is accepting the mandate of Isaiah 7:9) that the quest for philosophical understanding should begin with belief in religious traditions (Choice, pp. 3, 32). Both the Old Testament and the New Testament call for just behavior on the part of righteous people, with injustice being a sin against Gods law, the references being too numerous to cite (but see Job 9:2, Proverbs 4:18, Proverbs 10:6-7, Ecclesiastes 7:20, Matthew 5:45, Philippians 4:8, and Hebrews 12:23). The claim that Gods justice will prevail in the form of divine judgment is both a promise for the just and a threat for the unjust. Righteousness is identified with mercy as well as with justice (e.g., Micah 6:8 and Matthew 5:7) and involves our relationship with God as well as with fellow humans. The ten commandments of the Old Testament (Exodus 20:1-17) are prescriptions regarding how the righteous are to relate to God as well as to one another. In the New Testament, Jesus of Nazareth interprets how the righteous are to live (Matthew 22:36-40) in terms of love of both God and their neighbors; the concept of ones neighbor is meant to extend even to strangers, as is illustrated in the parable of the Good Samaritan (Luke 10:29-37). In the Beatitudes beginning the Sermon on the Mount, Jesus expands on this gospel of love by advocating that his followers go beyond the duties of justice to behave with compassion in certain supererogatory ways (Matthew 5:3-12). All of this scriptural tradition essentially influenced medieval thinkers such as Augustine and Aquinas in a way that distinguishes them from ancient Greek philosophers such as Plato and Aristotle.

a. Augustine

Aurelius Augustine was born and raised in the Roman province of North Africa; during his life, he experienced the injustices, the corruption, and the erosion of the Roman Empire. This personal experience, in dialectical tension with the ideals of Christianity, provided him with a dramatic backdrop for his religious axiology. Philosophically, he was greatly influenced by such neo-Platonists as Plotinus. His Christian Platonism is evident in his philosophical dialogue On Free Choice of the Will, in which he embraces Platos view of four central moral virtues (which came to be called cardinal, from the Latin word for hinges, these being metaphorically imaginable as the four hinges on which the door of morality pivots). These are prudence (substituted for wisdom), fortitude or courage, temperance, and justice. His conception of justice is the familiar one of the virtue by which all people are given their due. But this is connected to something new and distinctly Christianthe distinction between the temporal law, such as the law of the state, and the eternal, divine law of God. The eternal law establishes the order of Gods divine providence. And, since all temporal or human law must be consistent with Gods eternal law, Augustine can draw the striking conclusion that, strictly speaking, an unjust law is no law at all, an oxymoron (Choice, pp. 20, 11, 8; cf. Religion, p. 89, for an analysis of justice that relates it to love). Thus a civil law of the state that violates Gods eternal law is not morally binding and can be legitimately disobeyed in good conscience. This was to have a profound and ongoing influence on Christian ethics.

In his masterpiece, The City of God, Augustine draws the dramatic conclusion from this position that the Roman Empire was never a truly just political society. He expresses his disgust over its long history of revolting injustice. Rome was always a pagan, earthly city, and true justice can allegedly only be found in a Christian city of God. The just, rather than the powerful, should rule for the common good, rather than serving their own self-interest. He strikingly compares unjust societies, based on might rather than on right, to gangs of criminals on a large scale, for, without justice, a kingdom or empire is merely ruled by the arbitrary fiat of some leader(s). A genuinely just society must be based on Christian love, its peaceful order established by the following of two basic rulesthat people harm nobody and that they should try to help everyone to the extent that they can do so (City, pp. 75, 67, 75, 138-139, 873).

Despite his Christian commitment to love and peace, Augustine is not a pacifist and can support just wars as morally permissible and even as morally obligatory. Every war aims at the order of some sort of established peace; while an unjust war aims to establish an unjust peace of domination, a just war aims to establish a just peace. He agrees with Cicero that a just war must be defensive rather than aggressive (ibid., pp. 861-862, 866, 868-869, 1031). In a letter (# 138) to Marcellinus, Augustine uses scripture to deny that Christian doctrine is committed to pacifism, though wars should be waged, when necessary, with a benevolent love for the enemy. In a letter (# 189) to Boniface, he maintains that godly, righteous people can serve in the military, again citing scripture to support his position. He repeats the view that a just war should aim at establishing a lasting and just peace and holds that one must keep faith with both ones allies and ones enemies, even in the awful heat of warfare. Augustines most important treatment of the just war theory is contained in his writing Against Faustus the Manichean, where he analyzes the evils of war in terms of the desire to harm others, the lust for revenge and cruelty, and the wish to dominate other people. In addition to the condition that a just war must aim at establishing a just and lasting peace, a second condition is that it must be declared by a leader or body of leaders, with the authority to do so, after deliberating that it is justified. Again Augustine makes it clear that he is no pacifist (Political, pp. 209, 219-223).

While this is a very valuable application of his theory of justice, this doctrine of the just war standing the test of time to this very day, the general theory on which it is based is more problematic. The unoriginal (and uninspired) conception of justice as giving others their due had already become familiar to the point of being trite. It remains vulnerable to the serious problems of vagueness already considered: what is the relevant criterion whereby it should be determined who deserves what, and who is fit to make such a judgment? But, also, Augustine should have an advantage over the ancient Greeks in arriving at a theory of justice based on universal equality on account of the Christian doctrine (not to mention because of the influences of Cicero, the Stoics, and Plotinus) that all humans are equally children of God. Unfortunately, his zealous Christian evangelism leads him to identify justice itself, in a divisive, intolerant, polemical way, with the Christian churchs idea of what God requires, so that only a Christian society can possibly qualify as just, as if a just political society would need to be a theocracy. Thus, while he has some sense of some moral or spiritual equality among humans, it does not issue in equal respect for all persons as free, rational agents, allowing him, for example, to accept the institution of slavery as a just punishment for sin, despite the belief that God originally created humans as naturally free, because of the idea that we have all been corrupted by original sin (City, pp. 874-875).

b. Aquinas

As Augustine is arguably the greatest Christian Platonist, so Thomas Aquinas, from what is now Italy, is the greatest Christian Aristotelian. Nevertheless, as we shall see, his theory of justice is also quite compatible with Augustines. Aquinas discusses the same four cardinal moral virtues, including that of justice, in his masterpiece, the multi-volume Summa Theologica. No more a socio-political egalitarian than Plato, Aristotle, or Augustine, he analyzes it as calling for proportional equality, or equity, rather than any sort of strict numerical equality, and as a function of natural right rather than of positive law. Natural right ultimately stems from the eternal, immutable will of God, who created the world and governs it with divine providence. Natural justice must always take precedence over the contingent agreements of our human conventions. Human law must never contravene natural law, which is reasons way of understanding Gods eternal law. He offers us an Aristotelian definition, maintaining that justice is a habit whereby a man renders to each one his due by a constant and perpetual will. As a follower of Aristotle, he defines concepts in terms of genus and species. In this case, the general category to which justice belongs is that it is a moral habit of a virtuous character. What specifically distinguishes it from other moral virtues is that by justice, a person is consistently committed to respecting the rights of others over time. Strictly speaking, the virtue of justice always concerns interpersonal relations, so that it is only metaphorically that we can speak of a person being just to himself. In addition to legal justice, whereby a person is committed to serving the common good of the entire community, there is particular justice, which requires that we treat individuals in certain ways. Justice is a rational mean between the vicious extremes of deficiency and excess, having to do with our external actions regarding others. Like many of his predecessors, Aquinas considers justice to be preeminent among the moral virtues. He agrees with Aristotle in analyzing particular justice into two types, which he calls distributive and commutative; the former governs the proportional distribution of common goods, while the latter concerns the reciprocal dealings between individuals in their voluntary transactions (Law, pp. 137, 139, 145, 147, 155, 160, 163, 165).

Aquinas applies this theory of justice to many social problems. He maintains that natural law gives us the right to own private property. Given this natural right, theft (surreptitiously stealing anothers property) and robbery (taking it openly by force or the threat of violence) must be unjust, although an exception can arise if the thief and his family are starving in an environment of plenty, in which case, stealing is justified and, strictly speaking, not theft or robbery at all. Secondly, Aquinas refines the Augustinian just war theory by articulating three conditions that must jointly be met in order for the waging of war to be just: (a) it must be declared by a leader with socio-political authority; (b) it must be declared for a just cause, in that the people attacked must be at fault and thus deserve it; and (c) those going to war must intend good and the avoidance of evil. It is not justifiable deliberately to slay innocent noncombatants. It is legitimate to kill another in self-defense, though ones intention should be that of saving oneself, the taking of the others life merely being the necessary means to that good end (this, by the way, is the source of what later evolves into the moral principle of double effect). Even acting in self-defense must be done in reasonable proportion to the situation, so that it is wrong to employ more force than is necessary to stop aggression. Even killing another unintentionally can be unjust if done in the course of committing another crime or through criminal negligence. Thirdly, while Aquinas thinks we should tolerate the religious beliefs of those who have never been Christians, so that it would be unjust to persecute them, he thinks it just to use force against heretics who adhered to but then rejected orthodox Christianity, even to the point of hurting them, as in the Inquisition, for the good of their own souls. In an extreme case of recalcitrant heretics who will not be persuaded to return to the truth of Christianity, it is allegedly just that they should be exterminated by execution rather than being allowed to corrupt other Christians by espousing their heterodox religious views. Fourth, like Augustine, Aquinas accepts slavery, so long as no Christian is the slave of a non-Christian (ibid., pp. 178-183, 186, 221, 224, 226, 228, 250, 256, 253), and considers it just that women should be politically and economically subject to men. Although he considers women to be fully human, he agrees with Aristotle that they are defective and misbegotten, the consequence allegedly being inferior rational discretion (Summa, pp. 466-467).

From a critical perspective, his general theory of justice is, by now, quite familiar, a sort of blend of Aristotles and Augustines, and marked by the same flaws as theirs. His applications of the theory can be regarded as indicative of its problematic character: (a) given the assumption of a right to own private property, his discussion of the injustices of theft and robbery seems quite reasonable; (b) assuming that we have a right to self-defense, his analysis of the legitimacy of killing in a just war does also; (c) his attempted defense of the persecution of religious heretics, even unto death, invites suspicions of dogmatic, intolerant fanaticism on his part; and (d) his acceptance of slavery and the political and economic subjection of women as just is indicative of an empirical orientation that is too uncritically accepting of the status quo. Here again the Christian belief that all humans are personal creatures of a loving God is vitiated by an insufficient commitment to the implications of that, regarding socio-political equality, so that only some humans are fully respected as free, rational agents. The rationalistic theories of Plato and Augustine and the classical empirical theories of Aristotle and Aquinas all leave us hoping that preferable alternatives might be forthcoming.

3. Early Modernity

Although only half as much time elapses between Aquinas and Hobbes as did between Augustine and Aquinas, from the perspective of intellectual history, the period of modernism represents a staggering sea-change. We have neither the time nor the space to consider the complex causal nexus that explains this fact; but, for our purposes, suffice it to say that the Protestant Reformation, the revolution of the new science, and the progressive willingness publicly to challenge authority (both political and religious) converge to generate a strikingly different philosophical mentality in the seventeenth century. In the previous century, the Protestant Reformation shattered the hegemony of the Roman Catholic Church, so that thinkers need not feel so constrained to adhere to established orthodoxy. The naturalistic worldview of the sixteenth and early seventeenth centuries that eventuated in an empirical and experimental (non-dogmatic) methodology in both natural and political science set an example for philosophers. Thinkers of the modern era became increasingly comfortable breaking from the mainstream to pursue their own independent reasoning. Although the influence of great ancient philosophers like Plato and Aristotle and of great medieval thinkers such as Augustine and Aquinas would persist, there was no returning to their bygone perspectives. This vitally affects moral and political theory, in general, and views on justice, in particular. As we shall see in this section, views of justice as relative to human needs and interests became prominent as they had not been for a couple of millennia. This will locate Hobbes and Hume closer to the Sophists than had been fashionable since pre-Socratic times in philosophy, regarding justice as a social construct.

a. Hobbes

Whereas Plato, Aristotle, Augustine, and Aquinas all offer accounts of justice that represent alternatives to Sophism, Thomas Hobbes, the English radical empiricist, can be seen as resurrecting the Sophist view that we can have no objective knowledge of it as a moral or political absolute value. His radical empiricism does not allow him to claim to know anything not grounded in concrete sense experience. This leads him in Leviathan, his masterpiece, to conclude that anything real must be material or corporeal in nature, that body is the one and only sort of reality; this is the philosophical position of materialistic monism, which rules out the possibility of any spiritual substance. On this view, a man is a living body, only different in kind from other animals, but with no purely spiritual soul separating him from the beasts. Like other animals, man is driven by instinct and appetite, his reason being a capacity of his brain for calculating means to desirable ends. Another controversial claim here is that all actions, including all human actions, are causally determined to occur as they do by the complex of their antecedent conditions; this is causal determinism. What we consider voluntary actions are simply those we perform in which the will plays a significant causal role, human freedom amounting to nothing more exalted than the absence of external restraints. Like other animals, we are always fundamentally motivated by a survival instinct and ultimately driven by self-interest in all of our voluntary actions; this is psychological egoism. It is controversial whether he also holds that self-interest should always be our fundamental motivation, which is ethical egoism. In his most famous Chapter XIII, Hobbes paints a dramatic and disturbing portrait of what human life would be like in a state of naturethat is, beyond the conventional order of civil society. We would be rationally distrustful of one another, inclined to be anti-social, viewing others as threats to our own satisfaction and well-being. Interpersonal antagonism would be natural; and, since there would exist no moral distinctions between right and wrong, just and unjust, violent force and fraudulent deception would be desirable virtues rather than objectionable vices. In short, this would be a state of war of every man against every man, a condition in which we could not reasonably expect to survive for long or to enjoy any quality of life for as long as we did. We are smart enough to realize that this would be a condition in which, as Hobbes famously writes, the life of man would inevitably be solitary, poor, nasty, brutish, and short. Fortunately, our natural passions of fear, desire, and hope motivate us to use reason to calculate how we might escape this hellish state. Reason discovers a couple of basic laws of nature, indicating how we should prudently behave if we are to have any reasonable opportunity to survive, let alone to thrive. The first of these is double-sided: the positive side holds that we should try to establish peace with others, for our own selfish good, if we can; the negative side holds that, if we cannot do that, then we should do whatever it takes to destroy whoever might be a threat to our interests. The second law of nature maintains that, in order to achieve peace with others, we must be willing to give up our right to harm them, so long as they agree to reciprocate by renouncing their right to harm us. This mutual transferring of right, established by reciprocal agreement, is the so-called social contract that constitutes the basis of civil society; and the agreement can be made either explicitly or implicitly (Leviathan, pp. 261-262, 459-460, 79, 136, 82, 95, 74-78, 80-82; for comparable material, see Elements, pp. 78-84, 103-114, as well as Citizen, pp. 109-119, 123-124).

What is conspicuously missing here is any sense of natural justice or injustice. In the state of nature, all moral values are strictly relative to our desires: whatever seems likely to satisfy our desires appears good to us, and whatever seems likely to frustrate our desires we regard as evil. Its all relative to what we imaginatively associate with our own appetites and aversions. But as we move from this state of nature to the state of civil society by means of the social contract, we create the rules of justice by means of the agreements we strike with one another. Prior to the conventions of the contract, we were morally free to try to do whatever we wished. But when a covenant is made, then to break it is unjust; and the definition of injustice is no other than the not performance of covenant. What is not unjust, is just in civil society. This turns out to be the third law of nature, that, in the name of justice, we must try to keep our agreements. In civil society, we may justly do anything we have not, at least implicitly, committed ourselves not to do. A just person typically does just actions, though committing one or a few unjust actions does not automatically render that person unjust, especially if the unjust behavior stems from an error or sudden passion; on the other hand, a person who is typically inclined to commit unjust actions is a guilty person. Still, if we are as selfishly motivated by our own desires as Hobbes maintains, why should we not break our word and voluntarily commit injustice, if doing so is likely to pay off for us and we imagine we might get away with it (remember the problem posed by Glaucon with the story of the ring of Gyges)? Clearly one more element is needed to prevent the quick disintegration of the rules of justice so artificially constructed by interpersonal agreement. This is the power of sovereign authority. We need laws codifying the rules of justice; and they must be so vigilantly and relentlessly enforced by absolute political power that nobody in his right mind would dare to try to violate them. People simply cannot be trusted to honor their social commitments without being forced to do so, since covenants without the sword are but words, and of no strength to secure a man at all. In other words, we must sacrifice a great deal of our natural liberty to achieve the sort of security without which life is hardly worth living. In civil society, our freedom is relative to the lack of specified obligations, what Hobbes calls the silence of the law. If we worry that this invests too much power in the government, which may abuse that power and excessively trample on our freedom, the (cynical) response is that this is preferable to the chaos of the state of nature or to the horrors of civil war (Leviathan, pp. 28-29, 89, 93, 106, 109, 143, 117; for comparable material, see Elements, pp. 88-89, Citizen, pp. 136-140, and Common, p. 34). One of the most crucial problems of political philosophy is where to strike the balance between personal liberty and public order; Hobbes is, perhaps, more willing than most of us to give up a great deal of the former in order to secure the latter.

As we have with earlier thinkers, let us see how Hobbes applies this theory of justice, as a prelude to evaluating it critically. He compares the laws of civil society to artificial chains binding us to obey the sovereign authority of the state in the name of justice. The third law of nature, the law of justice, obliges us to obey the positive laws of the state. Any deliberate violation of civil law is a crime. Now the social problem to be considered is that of criminal punishment. This deliberately inflicts some sort of evil on an alleged criminal for violating civil law. Its rationale is to enforce obedience to the law itself and, thus, to promote security and public order. Hobbes lays down various conditions that must be met in order for such an infliction of evil to qualify as legitimate punishment, including that no retroactive punishment is justifiable. He also analyzes five sorts of criminal punishmentcorporal, or pecuniary, or ignominy, or imprisonment, or exile, allowing for a combination of them; he also specifies that the corporal sort can be capital punishment. It would be wrong for the state deliberately to punish a member of civil society believed to be innocent; indeed, strictly speaking, it would not even qualify as punishment, as it fails to meet an essential part of the definition. The severity of punishment should be relative to the severity of the crime involved, since its rationale is to deter future violations of civil law (Leviathan, pp. 138, 173, 175, 185, 190, 203-208, 230; see, also, Elements, pp. 177-182, and Citizen, pp. 271-279; near the end of his verse autobiographyElements, p. 264Hobbes writes, Justice I Teach, and Justice Reverence).

While this is a decent consequentialist theory of crime and punishment, the more general view of justice from which it is derived is far more problematic. It does stand in sharp contrast to the theories of Plato, Aristotle, Augustine, and Aquinas. It does revive something like the Sophist theory to which they were all advocating alternatives. And it does reflect the naturalistic approach represented by the new science. However, all the foundational elements supporting it are quite dubious: the radical empiricism, the materialism, the determinism, the egoism, the moral relativism, and the narrow conception of human reason. Without these props, this theory of justice as artificially constructed by us and purely a function of our interpersonal agreements seems entirely arbitrary. But in addition to its being insufficiently justified, this theory of justice would justify too much. For example, what would prevent its involving a justification of slavery, if the alternative for the slaves were death as enemies in a state of nature? Even apart from the issue of slavery, in the absence of any substantive human rights, minorities in civil society might be denied any set of civil liberties, such as the right to adopt religious practices to which they feel called in conscience. Hobbess conception of justice is reductionistic, reducing it to conventional agreements that seem skewed to sacrifice too much liberty on the altar of law and order.

b. Hume

As a transition between Hobbes and Hume, brief mention can be made of John Locke, the most important political philosopher between them. (The reason he is not being considered at length here is that he does not offer a distinctive general theory of justice.) In his masterful Second Treatise of Government, Locke describes a state of nature governed by Gods law but insecure in that there is no mechanism for enforcing it, when the natural rights of propertycomprising ones life, liberty, and estatesare violated. In order to protect such property rights, people agree to a social contract that moves them from that state of nature to a state of political society, with government established to enforce the law. Another great social contract theorist between Hobbes and Hume who is worth mentioning here (again he gives us no distinctive theory of justice) is Jean-Jacques Rousseau. In The Social Contract, he maintains that, in a well-ordered society, the general will (rather than the will of any individual or group of individuals) must prevail. True freedom in society requires following the general will, and those who do not choose to do so can legitimately be forced to do so. A human being is allegedly so transformed by the move from the state of nature to that of civil society as to become capable of such genuine freedom as will allow each citizen to consent to all the laws out of deference to the common good. David Hume, an eighteenth-century Scottish thinker, who is very influenced by Lockes focus on property while rejecting the social contract theory of Hobbes, Locke, and Rousseau, is an interesting philosopher to consider in relation to Hobbes. Like Hobbes, Hume is a radical empiricist and a determinist who is skeptical of justice as an objective, absolute virtue. But Hume does not explicitly embrace materialism, is not a psychological or ethical egoist, and famously attacks the social contract theorys account of moral and political obligation on both historical grounds (there is no evidence for it, and history shows that force rather than consent has been the basis of government) and philosophical grounds (even if our ancestors had given their consent, that would not be binding on us, and utility is a more plausible explanation of submission than genuine agreement) alike (Essays, pp. 186-201). In the third section of his Enquiry concerning the Principles of Morals, Hume argues that public utility is the sole origin of justice. To place that claim in context, we can note that, like Hobbes, Hume sees all values, including that of justice, as derived from our passions rather than (as Plato, Aristotle, Augustine, and Aquinas thought) from reason. Any virtue, he maintains, is desirable in that it provides us with the pleasant feeling of approval; and any vice, including that of injustice, is undesirable in that it provides us with the painful sense of disapproval. In order to qualify as a virtue, a quality must be useful or agreeable to the person himself or to others. It is possible for some virtues to be rich enough to fit appropriately in more than one of these four categories (for example, benevolence seems to be useful and agreeable to both the benevolent person and to others); but justice is purportedly a virtue only because it is useful to others, as members of society. Hume offers us a unique and fascinating argument to prove his point. He imagines four hypothetical scenarios, in which either human nature would be radically different (utterly altruistic or brutally selfish) or our environment would be so (with everything we desire constantly and abundantly available or so destitute that hardly anyone could survive), allegedly showing that, in each of them, justice would not be a virtue at all. His conclusion is that justice is only a virtue because, relative to reality, which is intermediate among these extremes, it is beneficial to us as members of society. He also refuses to identify justice with perfect equality, maintaining that the ideal of egalitarianism is both impracticable and extremely pernicious to human society. For Hume, the rules of justice essentially involve protecting private property, although property rights are not absolute and may be abridged in extreme cases where public safety and the common good require it. Even international relations normally require that rules of justice be observed for mutual advantage, although public utility can also require that they should be suspended (Enquiry, pp. 20, 85, 72, 21-25, 28-35; see also Essays, pp. 20, 202). Though different from Hobbess theory, this one also leans towards the Sophist view of justice as conventional and relative.

In his masterpiece, A Treatise of Human Nature, Hume makes the striking claim, Reason is, and ought only to be the slave of the passions, which rules out all forms of ethical rationalism. He also makes a remarkable distinction between descriptive language regarding what is, and is not, on the one hand, and prescriptive language concerning what ought, or ought not to be, on the other, challenging the possibility of ever justifying value claims by means of any factual ones, of logically inferring what should be from what is. The second part of Book 3 of Humes Treatise deals extensively with justice. Here he calls it an artificial but not arbitrary virtue, in that we construct it as a virtue for our own purposes, relative to our needs and circumstances, as we experience them. It is valuable as a means to the end of social cooperation, which is mutually advantageous. An especially beneficial, if unnatural, convention is respecting others property, which is what the rules of justice essentially require of us. The psychological grounds of our sense of justice are a combination of self-interest and sympathy for others. He holds a very conservative view of property rights, in that, normally, people should be allowed to keep what they already have acquired. Indeed, justice normally comprises three principlesof the stability of possession, of its transference by consent, and of the performance of promises. He rejects the traditional definition of justice as giving others their due, because it rashly and wrongly assumes that right and property have prior objective reality independent of conventions of justice. Internationally, the rules of justice assume the status of the law of nations, obliging civilized governments to respect the ambassadors of other countries, to declare war prior to engaging them in battle, to refrain from using poisonous weapons against them, and so forth. The rationale for such principles of international justice is that they reduce the horrors of war and facilitate the advantages of peace. By respecting other societies possessions, leaders minimize the likelihood of war; by respecting the transference of possessions by mutual consent, they enhance the possibilities of international trade; and by keeping their promises, they create a climate for peaceful alliances. A bit later, Hume adopts a position which, in the twentieth century, has been called a rule utilitarian view of justice, writing that, though individual acts of justice might be contrary to public utility, they ought to be performed if they are conducive to a general scheme or system of conduct that benefits society as a whole (Treatise, pp. 266, 302, 311, 307, 312, 315, 320-321, 323, 337-338, 362-363, 370-371). Yet the rules of justice that are normally conducive to public utility are never absolute and can be legitimately contravened where following them would seem to do more harm than good to our society. He applies this view to the issue of civil disobedience, which is normally unjust because it threatens public utility but can be justified as a last resort in extraordinary circumstances when that same public utility is in jeopardy (Essays, pp. 202-204). Whether that is or is not the case in specific circumstances becomes a judgment call.

Hume is important here because of a convergence of several factors. First, like the Sophists and Hobbes, he makes justice a social construct that is relative to human needs and interests. Second, like Hobbes, he associates it fundamentally with human passions rather than with reason. Third, the virtue of justice and the rules of justice are essentially connected to the protection of private property. And, fourth, he considers public utility to be the sole basis of justice. This theory would prove extremely influential, in that Kant will take issue with it, while utilitarians like Mill will build on its flexibility. This sort of flexibility is both a strength and a weakness of Humes theory of justice. While it may be attractive to allow for exceptions to the rules, this also creates a kind of instability. Is justice merely an instrumental good, having no intrinsic value? If that were the case, then it would make sense to say that the role of reason is simply to calculate the most effective means to our most desirable ends. But then, assuming that our ends were sufficiently desirable, any means necessary to achieve them would presumably be justifiableso that, morally and politically, anything goes, in principle, regardless how revolting. Finally, notice that Hume himself, because of the empirical nature of his practical philosophy, fails to avoid the is-ought trap against which he so deftly warned us: because some end is sufficiently desired, whatever means are necessary, or even most effective, to achieve it ought to be pursued. Is this the best we can do in our pursuit of an adequate theory of justice?

4. Recent Modernity

Moving from one of the greatest philosophers of the Enlightenment to the other, we shall see that Kant will take more seriously the is-ought challenge than Hume himself did. As justice is both a moral and a political virtue, helping to prescribe both a good character and right conduct, the question of how such obligations arise is crucial. For Hume, we ought to pursue virtue (including justice) because it (allegedly) is agreeable and/or useful to do so. But, then, what is the logical link here? Why should we, morally speaking, act for the sake of agreeableness and utility? For Kant, the reason we should choose to do what is right has nothing to do with good consequences. It is merely because it is the right thing to do. Conceding that prescriptive ought claims can never be logically deduced from any set of factually descriptive is claims, Kant will forsake the empirical approach to justice (of Hobbes and Hume) in favor of the sort of rationalistic one that will revert to seeing it as an absolute value, not to be compromised, regardless of circumstances and likely consequences. Then we shall consider the utilitarian response to this, as developed by the philosopher who is, arguably, the greatest consequentialist of modern times, John Stuart Mill, who, as an empiricist, like Hobbes and Hume, will make what is right a function of what is good.

a. Kant

Immanuel Kant, an eighteenth-century German professor from East Prussia, found his rationalistic philosophical convictions profoundly challenged by Humes formidable skepticism (as well as being fascinated by the ideas of Rousseau). Even though he was not convinced by it, Kant was sufficiently disturbed by it that he committed decades to trying to answer it, creating a revolutionary new philosophical system in order to do so. This system includes, but is far from limited to, a vast, extensive practical philosophy, comprising many books and essays, including a theory of justice. It is well known that this practical philosophyincluding both his ethical theory and socio-political philosophyis the most renowned example of deontology (from the Greek, meaning the study or science of duty). Whereas teleological or consequentialist theories (such as those of Hobbes and Hume) see what is right as a function of and relative to good ends, a deontological theory such as Kants sees what is right as independent of what we conceive to be good and, thus, as potentially absolute. Justice categorically requires a respect for the right, regardless of inconvenient or uncomfortable circumstances and regardless of desirable and undesirable consequences. Because of the is-ought problem, the best way to proceed is to avoid the empirical approach that is necessarily committed to trying to derive obligations from alleged facts.

This is precisely Kants approach in the foundational book of his system of practical philosophy, his Grounding for the Metaphysics of Morals. He argues, in its Preface, that, since the moral law must carry with it absolute necessity and since empiricism only yields contingent and uncertain results, we must proceed by way of pure practical reason, which would be, to the extent possible, purified of everything empirical, such as physiological, psychological, and environmental contingencies. On this view, matters of right will be equally applicable to all persons as potentially autonomous rational agents, regardless of any contingent differences, of gender, racial or ethnic identity, socio-economic class status, and so forth. If Kant can pull this off, it will take him further in the direction of equality of rights than any previous philosopher considered here. In order to establish a concept of right that is independent of empirical needs, desires, and interests, Kant argues for a single fundamental principle of all duty, which he calls the categorical imperative, because it tells us what, as persons, we ought to do, unconditionally. It is a test we can use to help us rationally to distinguish between right and wrong; and he offers three different formulations of it which he considers three different ways of saying the same thing: (a) the first is a formula of universalizability, that we should try to do only what we could reasonably will should become a universal law; (b) the second is a formula of respect for all persons, that we should try always to act in such a way as to respect all persons, ourselves and all others, as intrinsically valuable ends in themselves and never treat any persons merely as instrumental means to other ends; and (c) the third is a principle of autonomy, that we, as morally autonomous rational agents, should try to act in such a way that we could be reasonably legislating for a (hypothetical) moral republic of all persons. For the dignity of all persons, rendering them intrinsically valuable and worthy of respect, is a function of their capacity for moral autonomy. In his Metaphysics of Morals, Kant develops his ethical system, beyond this foundation, into a doctrine of right and a doctrine of virtue. The former comprises strict duties of justice, while the latter comprises broader duties of merit. Obviously, it is the former category, duties we owe all other persons, regardless of circumstances and consequences, that concerns us here, justice being a matter of strict right rather than one of meritorious virtue. At the very end of his Metaphysics of Morals, Kant briefly discusses divine justice, whereby God legitimately punishes people for violating their duties (Ethical, pp. 2-3, 30-44, 36, 48, 158-161).

In his Metaphysical Elements of Justice, which constitutes the first part of his Metaphysics of Morals, Kant develops his theory of justice. (His concept of Rechtslehreliterally, doctrine of righthas also been translated as doctrine of justice and doctrine of law.) For Kant, justice is inextricably bound up with obligations with which we can rightly be required to comply. To say that we have duties of justice to other persons is to indicate that they have rights, against us, that we should perform those dutiesso that duties of justice and rights are correlative. Three conditions must be met in order that the concept of justice should apply: (a) we must be dealing with external interpersonal behaviors; (b) it must relate to willed action and not merely to wishes, desires, and needs; and (c) the consequences intended are not morally relevant. A person is not committing an injustice by considering stealing anothers property or in wanting to do so, but only by voluntarily taking action to appropriate it without permission; and the act is not justified no matter what good consequences may be intended. According to Kant, there is only one innate human right possessed by all persons; that is the right freely to do what one wills, so long as that is compatible with the freedom of everyone else in accordance with a universal law. Thus one persons right freely to act cannot extend to infringing on the freedom of others or the violation of their rights. This leads to Kants ultimate universal principle of justice, which is itself a categorical imperative: Every action is just [right] that in itself or in its maxim is such that the freedom of the will of each can coexist together with the freedom of everyone in accordance with a universal law. Although the use of coercive force against other persons involves an attempt to restrict their freedom, this is not necessarily unjust, if it is used to counteract their unjust abuse of freedomfor example, in self-defense or punishment or even war. Kant approvingly invokes three ancient rules of justice: (1) we should be honest in our dealings with others; (2) we should avoid being unjust towards others even if that requires our trying to avoid them altogether; and (3) if we cannot avoid associating with others, we should at least try to respect their rights (Justice, pp. 29, 38, 30-31, 37; see also Lectures, pp. 211-212).

Kant distinguishes between natural or private justice, on the one hand, and civil or public justice, on the other. He has an intricate theory of property rights, which we can only touch upon here. We can claim, in the name of justice, to have rights to (a) physical property, such as your car, (b) the performance of a particular deed by another person, such as the auto shop keeping its agreement to try to fix your car, and (c) certain characteristics of interpersonal relationships with those under our authority, such as obedient children and respectful servants. Someone who steals your car or the auto mechanic who has agreed to fix it and then fails to try to do so is doing you an injustice. Children, as developing but dependent persons, have a right to support and care from their parents; but, in turn, they owe their parents obedience while under their authority. Children are not the property of their parents and must never be treated like things or objects; and, when they have become independent of their parents, they owe them nothing more than gratitude. Similarly, a master must respect a servant as a person. The servant may be under contract to serve the master, but that contract cannot be permanent or legitimately involve the giving up of the servants personhood (in other words, one cannot justifiably enter into slavery). While the master has authority over the servant, that must never be viewed as ownership or involve abuse. This all concerns private or natural justice, having to do with the securing of property rights. Next let us next consider how Kant applies his theory of justice to the problem of crime and punishment, in the area of public or civil justice, involving protective, commutative, and distributive justice, the requirements of which can be legitimately enforced by civil society. When a person commits a crime, that involves misusing freedom to infringe the freedom of others or to violate their rights. Thus the criminal forfeits the right to freedom and can become a legitimate prisoner of the state. Kant considers the rule that criminals should be punished for their crimes to be a categorical imperative, a matter of just retribution not to be denied or even mitigated for utilitarian reasons. This extends to the ultimate punishment, the death penalty: justice requires that murderers, the most heinous criminals, should suffer capital punishment, as no lesser penalty would be just. A third application to consider here is that of war. This is in the international part of public justice that Kant calls the Law of Nations. He adopts a non-empirical version of the social contract theory, interpreting it not as a historical fact mysteriously generating obligations but rather as a hypothetical idea of what free and equal moral agents could reasonably agree to in the way of rules of justice. Unlike Hobbes, he does not see this as a basis for all moral duty. It does account for the obligation we have to the state and other citizens. But states have duties to other states, so that there is an international law of nations. Even though different states, in the absence of international law, are in a natural condition of a state of war, as Hobbes thought, he was wrong to think that, in that state, anything rightly goes and that there is no justice. War is bad, and we should try to minimize the need for it, although Kant is not a pacifist and can justify it for purposes of self-defense. Kant proposes an international league of nations to help provide for mutual protection against external aggression and, thus, to discourage it and reduce the need to go to war. Still, when war cannot be avoided, it should be declared rather than launched by means of a sneak attack; secondly, there are legitimate limits that prohibit, for example, trying to exterminate or subjugate all members of the enemy society; third, when a war is over, the winning party cannot destroy the civil freedom of the losing parties, as by enslaving them; and, fourth, certain rights of peace must be assured and honored for all involved. Thus the ultimate goal of international relations and of the league of nations should be the ideal of perpetual peace among different states that share our planet (Justice, pp. 41, 43, 91-95, 113, 136-141, 146, 151-158; for more on Kants version of the social contract theory, see Writings, pp. 73-85, and for more on his views on war and perpetual peace, see Writings, pp. 93-130). Thus we see Kant applying his own theory of justice in three areas: in the area of private law having to do with the securing of property rights, in the area of public law having to do with retributive punishment for crimes committed, and in the area of international justice concerned with war and peace.

What shall we critically say about this theory? First, it argues for a sense of justice in terms of objective, non-arbitrary rightagainst, say, Hobbes and Hume. Second, this sense of justice is of a piece with Kants categorical imperative, in that the rules of justice (e.g., regarding property rights, punishment, and war) are universalizable, designed to respect persons as intrinsically valuable, and conforming to the principle of autonomy. Third, if Hume is correct in suggesting that we can never logically infer what ought to be from what actually is, then Kants is the only theory we have considered thus far that can pass the test. To focus the issue, ask the question, why should we be just? For Plato, this is the way to achieve the fulfillment of a well-ordered soul. For Aristotle, the achievement and exercising of moral virtue is a necessary condition of human flourishing. For Augustine and Aquinas, Gods eternal law requires that we, as Gods personal creatures, should be just, with our salvation at stake. For Hobbes, practicing justice is required by enlightened self-interest. For Hume, even though our being just may not benefit us directly all the time, it is conducive to public utility or the good of the society of which we are members. But for each of these claims, we can ask, so what? If any combination of these claims were to turn out to be correct, we could still legitimately ask why we should therefore be just. Are we to assume that we ought to do whatever it takes to achieve a well-ordered soul or to flourish or to comply with Gods will or to serve our own self-interest or public utility? Why? Consider Kants answer: we should try to be just because its the right thing to do and because it is our duty, as rational, moral agents, to try to do what is right. Kants analysis of justice works well; and, given that, his applications to property rights, crime and punishment, and war and peace are also impressive. Yet his theory is commonly rejected as too idealistic to be realistically applicable in the so-called real world, because it maintains that some things can be absolutely unjust and are, thus, categorically impermissible, regardless of likely consequences. His theory as we have considered it here is a paradigmatic example of the view of justice being advocated in this article, as essentially requiring respect for persons as free, rational agents. Yet Kants inflexibility in other points of application, such as in his absolute prohibition against lying to a would-be murderer in order to save innocent human life (Ethical, pp. 162-166), his idea that women and servants are merely passive citizens unfit to vote, and his categorical denial of any right to resistance or revolution against oppression (Justice, pp. 120, 124-128), is problematic here, inviting an alternative such as is represented by Mills utilitarianism.

b. Mill

Let us consider a bit of Karl Marx (and his collaborator Friedrich Engels) as a quick transition between Kant and Mill. Kant represents the very sort of bourgeois conception of justice against which Marx and Engels protest in their call, in The Communist Manifesto, for a socialistic revolution. Marx explains the ideal of socio-economic equality he advocates with the famous slogan that all should be required to contribute to society to the extent of their abilities and all should be allowed to receive from society in accordance with their needs. John Stuart Mill, a nineteenth-century English philosopher, was aware of the call for a Communist revolution and advocated progressive liberal reform as an alternative path to political evolution. Whereas Kant was the first great deontologist, Mill subscribed to the already established tradition of utilitarianism. Although earlier British thinkers (including Hobbes and Hume) were proto-utilitarians, incorporating elements of the theory into their own worldviews, the movement, as such, is usually thought to stem from the publication of Jeremy Benthams Introduction to the Principles of Morals and Legislation in 1789. He there proposes the principle of utility, which he also later calls the greatest happiness principle, as the desirable basis for individual and collective decision-making: By the principle of utility is meant that principle which approves or disapproves of every action whatsoever, according to the tendency which it appears to have to augment or diminish the happiness of the party whose interest is in question. That single sentence establishes the ultimate criterion for utilitarian reasoning and the root of a great movement. A famous lawyer named John Austin, under whom Mill studied, wrote a book of jurisprudence based on Benthams principle of general utility. Mills father, James Mill, was a friend and disciple of Bentham and educated his only son also to be a utilitarian. Near the end of his life, Mill observed that it was the closest thing to a religion in which his father raised him. And, if he was not the founder of this secular religion, he clearly became its most effective evangelist. In Utilitarianism, his own great essay in ethical theory, Mill gives his own statement of the principle of utility (again employing a curiously religious word): The creed which accepts as the foundation of morals, Utility, or the Greatest Happiness Principle, holds that actions are right in proportion as they tend to promote happiness, wrong as they tend to produce the reverse of happiness. He immediately proceeds to interpret human happiness and unhappiness (as Bentham had done) in hedonistic terms of pleasure and pain (Utilitarianism, pp. 33-34, 329, 257). This presents the deceptive appearance of a remarkably simple rubric for practical judgment: if an action generates an excess of pleasure over pain, that contributes to human happiness, which is our greatest good, making the action right; on the other hand, if an action generates an excess of pain over pleasure, that contributes to human unhappiness, which is our greatest evil, making the action wrong. But what is deceptive about this is the notion that we can sufficiently anticipate future consequences to be able to predict where our actions will lead us. (Notice, also, that unlike Kantian deontology, which makes what is right independent of good consequences, utilitarianism makes the former a function of the latter.)

Mill acknowledges that concern about a possible conflict between utility and justice has always been one of the strongest obstacles to the acceptance of utilitarianism. If permanently enslaving a minority could produce overwhelming happiness for a majority (he was personally opposed to slavery as an unconscionable violation of human liberty), then, given that utility is the value that trumps all others, why shouldnt the injustice of slavery be accepted as a (regrettably) necessary means to a socially desirable end, the former, however unfortunate, being thus justified? Mill thinks that the key to solving this alleged problem is that of conceptual analysis, that if we properly understand what utility and justice are all about, we shall be able to see that no genuine conflict between them is possible. We have already discerned what the former concept means and now need to elucidate the latter. Mill lays out five dimensions of justice as we use the term: (1) respecting others legal rights is considered just, while violating them is unjust; (2) respecting the moral right someone has to something is just, while violating it is unjust; (3) it is considered just to give a person what he deserves and unjust to deny it; (4) it is thought unjust to break faith with another, while keeping faith with others is just; and (5) in some circumstances, it is deemed unjust to be partial in ones judgments and just to be impartial. People commonly associate all of these with justice, and they do seem to represent legitimate aspects of the virtue. (Interestingly, Mill rejects the idea of equality as essential to o