GORGIAS, one of the most renowned of the dialogues in point of composition, is also ethical, but at variance with the Protagoras, and more in accordance with Plato's predominating views. The professed subject is Rhetoric, which, as an art, Sokrates professes to hold in contempt. The dialogue begins with the position that men are prompted by the desire of good, but proceeds to the great Platonic paradox, that it is a greater evil to do wrong than to suffer wrong. The criminal labours under a mental distemper, and the best thing that can happen to him, is to be punished that so he may be cured. The unpunished wrong-doer is more miserable than if he were punished. Sokrates in this dialogue maintains, in opposition to the thesis of Protagoras, that pleasure is not the same as good, that there are bad pleasures and good pains; and a skilful adviser, one versed in the science of good and evil, must discriminate between them. He does not mean that those pleasures only are bad that bring an overplus of future pains, which would be in accordance with the previous dialogue. The sentiment of the dialogue is ascetic and self-denying.[7] Order or Discipline is inculcated, not as a means to an end, but as an end in itself.

The POLITIKUS is on the Art of Government, and gives the Platonic beau idéal of the One competent person, governing absolutely, by virtue of his scientific knowledge, and aiming at the good and improvement of the governed. This is merely another illustration of the Sokratic ideal—a despotism, anointed by supreme good intentions, and by an ideal skill. The Republic is an enlargement of the lessons of the Politikus without the dialectic discussion.

The postulate of the One Wise man is repeated in KRATYLUS, on the unpromising subject of Language or the invention of Names.

The PHILEBUS has a decidedly ethical character. It propounds for enquiry the Good, the Summum Bonum. This is denied to be mere pleasure, and the denial is enforced by Sokrates challenging his opponent to choose the lot of an ecstatic oyster. As usual, good must be related to Intelligence; and the Dialogue gives a long disquisition upon the One and the Many, the Theory of Ideas, the Determinate and the Indeterminate. Good is a compound of Pleasure and Intelligence, the last predominating. Pleasure is the Indeterminate, requiring the Determinate (Knowledge) to regulate it. This is merely another expression for the doctrine of Measure, and for the common saying, that the Passions must be controlled by Reason. There is, also, in the dialogue, a good deal on the Psychology of Pleasure and Pain. Pleasure is the fundamental harmony of the system; Pain its disturbance. Bodily Pleasure pre-supposes pain [true only of some pleasures]. Mental pleasures may be without previous pain, and are therefore pure pleasures. A life of Intelligence is conceivable without either pain or pleasure; this is the choice of the Wise man, and is the nature of the gods. Desire is a mixed state, and comprehends body and mind. Much stress is laid on the moderate and tranquil pleasures; the intense pleasures, coveted by mankind, belong to a distempered rather than a healthy state; they are false and delusive. Pleasure is, by its nature, a change or transition, and cannot be a supreme end. The mixture of Pleasure and Intelligence is to be adjusted by the all-important principle of Measure or Proportion, which connects the Good with the Beautiful.

A decided asceticism is the ethical tendency of this dialogue. It is markedly opposed to the view of the Protagoras. Still greater is the opposition between it and the two Erotic dialogues, Phaedrus and Symposium, where Bonum and Pulchrum are attained in the pursuit of an ecstatic and overwhelming personal affection.

The REPUBLIC starts with the question—what is JUSTICE? and, in answering it, provides the scheme of a model Republic. Book I. is a Sokratic colloquy, where one speaker, on being interrogated, defines Justice as 'rendering to every man his due,' and afterwards amends it to 'doing good to friends, evil to enemies.' Another gives 'the right of the strongest.' A third maintains that Injustice by itself is profitable to the doer; but, as it is an evil to society in general, men make laws against it and punish it; in consequence of which, Justice is the more profitable. Sokrates, in opposition, undertakes to prove that Justice is good in itself, ensuring the happiness of the doer by its intrinsic effect on his mind; and irrespective of exemption from the penalties of injustice. He reaches this result by assimilating an individual to a state. Justice is shown to be good in the entire city, and by analogy it is also good in the individual. He accordingly proceeds to construct his ideal commonwealth. In the course of this construction many ethical views crop out.

The state must prescribe the religious belief, and allow no compositions at variance with it. The gods must always be set forth as the causes of good; they must never be represented as the authors of evil, nor as practising deceit. Neither is it to be allowed to represent men as unjust, yet happy; or just, and yet miserable. The poetic representation of bad characters is also forbidden. The musical training is to be adapted for disposing the mind to the perception of Beauty, whence it becomes qualified to recognize the other virtues. Useful fictions are to be diffused, without regard to truth. This pious fraud is openly recommended by Plato.

The division of the human mind into (1) REASON or Intelligence; (2) ENERGY, Courage, Spirit, or the Military Virtue; and (3) Many-headed APPETITE, all in mutual counter-play—is transferred to the State, each of the three parts being represented by one of the political orders or divisions of the community. The happiness of the man and the happiness of the commonwealth are attained in the same way, namely, by realizing the four virtues—Wisdom, Courage, Temperance, Justice; with this condition, that Wisdom, or Reason, is sought only in the Ruling caste, the Elders; Courage, or Energy, only in the second caste, the Soldiers or Guardians; while Temperance and Justice (meaning almost the same thing) must inhere alike in all the three classes, and be the only thing expected in the third, the Working Multitude.

If it be now asked, what and where is Justice? the answer is—'every man to attend to his own business.' Injustice occurs when any one abandons his post, or meddles with what does not belong to him; and more especially when any one of a lower division aspires to the function of a higher. Such is Justice for the city, and such is it in the individual; the higher faculty—Reason, must control the two lower—Courage and Appetite. Justice is thus a sort of harmony or balance of the mental powers; it is to the mind what health is to the body. Health is the greatest good, sickness the greatest evil, of the body; so is Justice of the mind.

It is an essential of the Platonic Republic that, among the guardians at least, the sexual arrangements should be under public regulation, and the monopoly of one woman by one man forbidden: a regard to the breed of the higher caste of citizens requires the magistrate to see that the best couples are brought together, and to refuse to rear the inferior offspring of ill-assorted connexions. The number of births is also to be regulated.