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The description of old age is finished, and Plato, as his manner is, has touched the key-note of the whole work in asking for the definition of justice, first suggesting the question which Glaucon afterwards pursues respecting external goods, and preparing for the concluding mythus of the world below in the slight allusion of Cephalus. The portrait of the just man is a natural frontispiece or introduction to the long discourse which follows, and may perhaps imply that in all our perplexity about the nature of justice, there is no difficulty in discerning 'who is a just man.' The first explanation has been supported by a saying of Simonides; and now Socrates has a mind to show that the resolution of justice into two unconnected precepts, which have no common principle, fails to satisfy the demands of dialectic.

...He proceeds: What did Simonides mean by this saying of his? Did he mean that I was to give back arms to a madman? 'No, not in that case, not if the parties are friends, and evil would result. He meant that you were to do what was proper, good to friends and harm to enemies.' Every act does something to somebody; and following this analogy, Socrates asks, What is this due and proper thing which justice does, and to whom? He is answered that justice does good to friends and harm to enemies. But in what way good or harm? 'In making alliances with the one, and going to war with the other.' Then in time of peace what is the good of justice? The answer is that justice is of use in contracts, and contracts are money partnerships. Yes; but how in such partnerships is the just man of more use than any other man? 'When you want to have money safely kept and not used.' Then justice will be useful when money is useless. And there is another difficulty: justice, like the art of war or any other art, must be of opposites, good at attack as well as at defence, at stealing as well as at guarding. But then justice is a thief, though a hero notwithstanding, like Autolycus, the Homeric hero, who was 'excellent above all men in theft and perjury'—to such a pass have you and Homer and Simonides brought us; though I do not forget that the thieving must be for the good of friends and the harm of enemies. And still there arises another question: Are friends to be interpreted as real or seeming; enemies as real or seeming? And are our friends to be only the good, and our enemies to be the evil? The answer is, that we must do good to our seeming and real good friends, and evil to our seeming and real evil enemies—good to the good, evil to the evil. But ought we to render evil for evil at all, when to do so will only make men more evil? Can justice produce injustice any more than the art of horsemanship can make bad horsemen, or heat produce cold? The final conclusion is, that no sage or poet ever said that the just return evil for evil; this was a maxim of some rich and mighty man, Periander, Perdiccas, or Ismenias the Theban (about B.C. 398-381)...

Thus the first stage of aphoristic or unconscious morality is shown to be inadequate to the wants of the age; the authority of the poets is set aside, and through the winding mazes of dialectic we make an approach to the Christian precept of forgiveness of injuries. Similar words are applied by the Persian mystic poet to the Divine being when the questioning spirit is stirred within him:—'If because I do evil, Thou punishest me by evil, what is the difference between Thee and me?' In this both Plato and Kheyam rise above the level of many Christian (?) theologians. The first definition of justice easily passes into the second; for the simple words 'to speak the truth and pay your debts' is substituted the more abstract 'to do good to your friends and harm to your enemies.' Either of these explanations gives a sufficient rule of life for plain men, but they both fall short of the precision of philosophy. We may note in passing the antiquity of casuistry, which not only arises out of the conflict of established principles in particular cases, but also out of the effort to attain them, and is prior as well as posterior to our fundamental notions of morality. The 'interrogation' of moral ideas; the appeal to the authority of Homer; the conclusion that the maxim, 'Do good to your friends and harm to your enemies,' being erroneous, could not have been the word of any great man, are all of them very characteristic of the Platonic Socrates.

...Here Thrasymachus, who has made several attempts to interrupt, but has hitherto been kept in order by the company, takes advantage of a pause and rushes into the arena, beginning, like a savage animal, with a roar. 'Socrates,' he says, 'what folly is this?—Why do you agree to be vanquished by one another in a pretended argument?' He then prohibits all the ordinary definitions of justice; to which Socrates replies that he cannot tell how many twelve is, if he is forbidden to say 2 x 6, or 3 x 4, or 6 x 2, or 4 x 3. At first Thrasymachus is reluctant to argue; but at length, with a promise of payment on the part of the company and of praise from Socrates, he is induced to open the game. 'Listen,' he says, 'my answer is that might is right, justice the interest of the stronger: now praise me.' Let me understand you first. Do you mean that because Polydamas the wrestler, who is stronger than we are, finds the eating of beef for his interest, the eating of beef is also for our interest, who are not so strong? Thrasymachus is indignant at the illustration, and in pompous words, apparently intended to restore dignity to the argument, he explains his meaning to be that the rulers make laws for their own interests. But suppose, says Socrates, that the ruler or stronger makes a mistake—then the interest of the stronger is not his interest. Thrasymachus is saved from this speedy downfall by his disciple Cleitophon, who introduces the word 'thinks;'—not the actual interest of the ruler, but what he thinks or what seems to be his interest, is justice. The contradiction is escaped by the unmeaning evasion: for though his real and apparent interests may differ, what the ruler thinks to be his interest will always remain what he thinks to be his interest.

Of course this was not the original assertion, nor is the new interpretation accepted by Thrasymachus himself. But Socrates is not disposed to quarrel about words, if, as he significantly insinuates, his adversary has changed his mind. In what follows Thrasymachus does in fact withdraw his admission that the ruler may make a mistake, for he affirms that the ruler as a ruler is infallible. Socrates is quite ready to accept the new position, which he equally turns against Thrasymachus by the help of the analogy of the arts. Every art or science has an interest, but this interest is to be distinguished from the accidental interest of the artist, and is only concerned with the good of the things or persons which come under the art. And justice has an interest which is the interest not of the ruler or judge, but of those who come under his sway.

Thrasymachus is on the brink of the inevitable conclusion, when he makes a bold diversion. 'Tell me, Socrates,' he says, 'have you a nurse?' What a question! Why do you ask? 'Because, if you have, she neglects you and lets you go about drivelling, and has not even taught you to know the shepherd from the sheep. For you fancy that shepherds and rulers never think of their own interest, but only of their sheep or subjects, whereas the truth is that they fatten them for their use, sheep and subjects alike. And experience proves that in every relation of life the just man is the loser and the unjust the gainer, especially where injustice is on the grand scale, which is quite another thing from the petty rogueries of swindlers and burglars and robbers of temples. The language of men proves this—our 'gracious' and 'blessed' tyrant and the like—all which tends to show (1) that justice is the interest of the stronger; and (2) that injustice is more profitable and also stronger than justice.'