The subject of the Charmides is Temperance or (Greek), a peculiarly Greek notion, which may also be rendered Moderation (Compare Cic. Tusc. '(Greek), quam soleo equidem tum temperantiam, tum moderationem appellare, nonnunquam etiam modestiam.'), Modesty, Discretion, Wisdom, without completely exhausting by all these terms the various associations of the word. It may be described as 'mens sana in corpore sano,' the harmony or due proportion of the higher and lower elements of human nature which 'makes a man his own master,' according to the definition of the Republic. In the accompanying translation the word has been rendered in different places either Temperance or Wisdom, as the connection seemed to require: for in the philosophy of Plato (Greek) still retains an intellectual element (as Socrates is also said to have identified (Greek) with (Greek): Xen. Mem.) and is not yet relegated to the sphere of moral virtue, as in the Nicomachean Ethics of Aristotle.

The beautiful youth, Charmides, who is also the most temperate of human beings, is asked by Socrates, 'What is Temperance?' He answers characteristically, (1) 'Quietness.' 'But Temperance is a fine and noble thing; and quietness in many or most cases is not so fine a thing as quickness.' He tries again and says (2) that temperance is modesty. But this again is set aside by a sophistical application of Homer: for temperance is good as well as noble, and Homer has declared that 'modesty is not good for a needy man.' (3) Once more Charmides makes the attempt. This time he gives a definition which he has heard, and of which Socrates conjectures that Critias must be the author: 'Temperance is doing one's own business.' But the artisan who makes another man's shoes may be temperate, and yet he is not doing his own business; and temperance defined thus would be opposed to the division of labour which exists in every temperate or well-ordered state. How is this riddle to be explained?

Critias, who takes the place of Charmides, distinguishes in his answer between 'making' and 'doing,' and with the help of a misapplied quotation from Hesiod assigns to the words 'doing' and 'work' an exclusively good sense: Temperance is doing one's own business;--(4) is doing good.

Still an element of knowledge is wanting which Critias is readily induced to admit at the suggestion of Socrates; and, in the spirit of Socrates and of Greek life generally, proposes as a fifth definition, (5) Temperance is self-knowledge. But all sciences have a subject: number is the subject of arithmetic, health of medicine--what is the subject of temperance or wisdom? The answer is that (6) Temperance is the knowledge of what a man knows and of what he does not know. But this is contrary to analogy; there is no vision of vision, but only of visible things; no love of loves, but only of beautiful things; how then can there be a knowledge of knowledge? That which is older, heavier, lighter, is older, heavier, and lighter than something else, not than itself, and this seems to be true of all relative notions--the object of relation is outside of them; at any rate they can only have relation to themselves in the form of that object. Whether there are any such cases of reflex relation or not, and whether that sort of knowledge which we term Temperance is of this reflex nature, has yet to be determined by the great metaphysician. But even if knowledge can know itself, how does the knowledge of what we know imply the knowledge of what we do not know? Besides, knowledge is an abstraction only, and will not inform us of any particular subject, such as medicine, building, and the like. It may tell us that we or other men know something, but can never tell us what we know.

Admitting that there is a knowledge of what we know and of what we do not know, which would supply a rule and measure of all things, still there would be no good in this; and the knowledge which temperance gives must be of a kind which will do us good; for temperance is a good. But this universal knowledge does not tend to our happiness and good: the only kind of knowledge which brings happiness is the knowledge of good and evil. To this Critias replies that the science or knowledge of good and evil, and all the other sciences, are regulated by the higher science or knowledge of knowledge. Socrates replies by again dividing the abstract from the concrete, and asks how this knowledge conduces to happiness in the same definite way in which medicine conduces to health.

And now, after making all these concessions, which are really inadmissible, we are still as far as ever from ascertaining the nature of temperance, which Charmides has already discovered, and had therefore better rest in the knowledge that the more temperate he is the happier he will be, and not trouble himself with the speculations of Socrates.

In this Dialogue may be noted (1) The Greek ideal of beauty and goodness, the vision of the fair soul in the fair body, realised in the beautiful Charmides; (2) The true conception of medicine as a science of the whole as well as the parts, and of the mind as well as the body, which is playfully intimated in the story of the Thracian; (3) The tendency of the age to verbal distinctions, which here, as in the Protagoras and Cratylus, are ascribed to the ingenuity of Prodicus; and to interpretations or rather parodies of Homer or Hesiod, which are eminently characteristic of Plato and his contemporaries; (4) The germ of an ethical principle contained in the notion that temperance is 'doing one's own business,' which in the Republic (such is the shifting character of the Platonic philosophy) is given as the definition, not of temperance, but of justice; (5) The impatience which is exhibited by Socrates of any definition of temperance in which an element of science or knowledge is not included; (6) The beginning of metaphysics and logic implied in the two questions: whether there can be a science of science, and whether the knowledge of what you know is the same as the knowledge of what you do not know; and also in the distinction between 'what you know' and 'that you know,' (Greek;) here too is the first conception of an absolute self-determined science (the claims of which, however, are disputed by Socrates, who asks cui bono?) as well as the first suggestion of the difficulty of the abstract and concrete, and one of the earliest anticipations of the relation of subject and object, and of the subjective element in knowledge--a 'rich banquet' of metaphysical questions in which we 'taste of many things.' (7) And still the mind of Plato, having snatched for a moment at these shadows of the future, quickly rejects them: thus early has he reached the conclusion that there can be no science which is a 'science of nothing' (Parmen.). (8) The conception of a science of good and evil also first occurs here, an anticipation of the Philebus and Republic as well as of moral philosophy in later ages.

The dramatic interest of the Dialogue chiefly centres in the youth Charmides, with whom Socrates talks in the kindly spirit of an elder. His childlike simplicity and ingenuousness are contrasted with the dialectical and rhetorical arts of Critias, who is the grown-up man of the world, having a tincture of philosophy. No hint is given, either here or in the Timaeus, of the infamy which attaches to the name of the latter in Athenian history. He is simply a cultivated person who, like his kinsman Plato, is ennobled by the connection of his family with Solon (Tim.), and had been the follower, if not the disciple, both of Socrates and of the Sophists. In the argument he is not unfair, if allowance is made for a slight rhetorical tendency, and for a natural desire to save his reputation with the company; he is sometimes nearer the truth than Socrates. Nothing in his language or behaviour is unbecoming the guardian of the beautiful Charmides. His love of reputation is characteristically Greek, and contrasts with the humility of Socrates. Nor in Charmides himself do we find any resemblance to the Charmides of history, except, perhaps, the modest and retiring nature which, according to Xenophon, at one time of his life prevented him from speaking in the Assembly (Mem.); and we are surprised to hear that, like Critias, he afterwards became one of the thirty tyrants. In the Dialogue he is a pattern of virtue, and is therefore in no need of the charm which Socrates is unable to apply. With youthful naivete, keeping his secret and entering into the spirit of Socrates, he enjoys the detection of his elder and guardian Critias, who is easily seen to be the author of the definition which he has so great an interest in maintaining. The preceding definition, 'Temperance is doing one's own business,' is assumed to have been borrowed by Charmides from another; and when the enquiry becomes more abstract he is superseded by Critias (Theaet.; Euthyd.). Socrates preserves his accustomed irony to the end; he is in the neighbourhood of several great truths, which he views in various lights, but always either by bringing them to the test of common sense, or by demanding too great exactness in the use of words, turns aside from them and comes at last to no conclusion.

The definitions of temperance proceed in regular order from the popular to the philosophical. The first two are simple enough and partially true, like the first thoughts of an intelligent youth; the third, which is a real contribution to ethical philosophy, is perverted by the ingenuity of Socrates, and hardly rescued by an equal perversion on the part of Critias. The remaining definitions have a higher aim, which is to introduce the element of knowledge, and at last to unite good and truth in a single science. But the time has not yet arrived for the realization of this vision of metaphysical philosophy; and such a science when brought nearer to us in the Philebus and the Republic will not be called by the name of (Greek). Hence we see with surprise that Plato, who in his other writings identifies good and knowledge, here opposes them, and asks, almost in the spirit of Aristotle, how can there be a knowledge of knowledge, and even if attainable, how can such a knowledge be of any use?

The difficulty of the Charmides arises chiefly from the two senses of the word (Greek), or temperance. From the ethical notion of temperance, which is variously defined to be quietness, modesty, doing our own business, the doing of good actions, the dialogue passes onto the intellectual conception of (Greek), which is declared also to be the science of self-knowledge, or of the knowledge of what we know and do not know, or of the knowledge of good and evil. The dialogue represents a stage in the history of philosophy in which knowledge and action were not yet distinguished. Hence the confusion between them, and the easy transition from one to the other. The definitions which are offered are all rejected, but it is to be observed that they all tend to throw a light on the nature of temperance, and that, unlike the distinction of Critias between (Greek), none of them are merely verbal quibbles, it is implied that this question, although it has not yet received a solution in theory, has been already answered by Charmides himself, who has learned to practise the virtue of self-knowledge which philosophers are vainly trying to define in words. In a similar spirit we might say to a young man who is disturbed by theological difficulties, 'Do not trouble yourself about such matters, but only lead a good life;' and yet in either case it is not to be denied that right ideas of truth may contribute greatly to the improvement of character.

The reasons why the Charmides, Lysis, Laches have been placed together and first in the series of Platonic dialogues, are: (i) Their shortness and simplicity. The Charmides and the Lysis, if not the Laches, are of the same 'quality' as the Phaedrus and Symposium: and it is probable, though far from certain, that the slighter effort preceded the greater one. (ii) Their eristic, or rather Socratic character; they belong to the class called dialogues of search (Greek), which have no conclusion. (iii) The absence in them of certain favourite notions of Plato, such as the doctrine of recollection and of the Platonic ideas; the questions, whether virtue can be taught; whether the virtues are one or many. (iv) They have a want of depth, when compared with the dialogues of the middle and later period; and a youthful beauty and grace which is wanting in the later ones. (v) Their resemblance to one another; in all the three boyhood has a great part. These reasons have various degrees of weight in determining their place in the catalogue of the Platonic writings, though they are not conclusive. No arrangement of the Platonic dialogues can be strictly chronological. The order which has been adopted is intended mainly for the convenience of the reader; at the same time, indications of the date supplied either by Plato himself or allusions found in the dialogues have not been lost sight of. Much may be said about this subject, but the results can only be probable; there are no materials which would enable us to attain to anything like certainty.

The relations of knowledge and virtue are again brought forward in the companion dialogues of the Lysis and Laches; and also in the Protagoras and Euthydemus. The opposition of abstract and particular knowledge in this dialogue may be compared with a similar opposition of ideas and phenomena which occurs in the Prologues to the Parmenides, but seems rather to belong to a later stage of the philosophy of Plato.