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The doctrine that virtue and art are in a mean, which is familiarized to us by the study of the Nicomachean Ethics, is also first distinctly asserted in the Statesman of Plato. The too much and the too little are in restless motion: they must be fixed by a mean, which is also a standard external to them. The art of measuring or finding a mean between excess and defect, like the principle of division in the Phaedrus, receives a particular application to the art of discourse. The excessive length of a discourse may be blamed; but who can say what is excess, unless he is furnished with a measure or standard? Measure is the life of the arts, and may some day be discovered to be the single ultimate principle in which all the sciences are contained. Other forms of thought may be noted—the distinction between causal and co-operative arts, which may be compared with the distinction between primary and co-operative causes in the Timaeus; or between cause and condition in the Phaedo; the passing mention of economical science; the opposition of rest and motion, which is found in all nature; the general conception of two great arts of composition and division, in which are contained weaving, politics, dialectic; and in connexion with the conception of a mean, the two arts of measuring.

In the Theaetetus, Plato remarks that precision in the use of terms, though sometimes pedantic, is sometimes necessary. Here he makes the opposite reflection, that there may be a philosophical disregard of words. The evil of mere verbal oppositions, the requirement of an impossible accuracy in the use of terms, the error of supposing that philosophy was to be found in language, the danger of word-catching, have frequently been discussed by him in the previous dialogues, but nowhere has the spirit of modern inductive philosophy been more happily indicated than in the words of the Statesman:—'If you think more about things, and less about words, you will be richer in wisdom as you grow older.' A similar spirit is discernible in the remarkable expressions, 'the long and difficult language of facts;' and 'the interrogation of every nature, in order to obtain the particular contribution of each to the store of knowledge.' Who has described 'the feeble intelligence of all things; given by metaphysics better than the Eleatic Stranger in the words—'The higher ideas can hardly be set forth except through the medium of examples; every man seems to know all things in a kind of dream, and then again nothing when he is awake?' Or where is the value of metaphysical pursuits more truly expressed than in the words,—'The greatest and noblest things have no outward image of themselves visible to man: therefore we should learn to give a rational account of them?'

III. The political aspects of the dialogue are closely connected with the dialectical. As in the Cratylus, the legislator has 'the dialectician standing on his right hand;' so in the Statesman, the king or statesman is the dialectician, who, although he may be in a private station, is still a king. Whether he has the power or not, is a mere accident; or rather he has the power, for what ought to be is ('Was ist vernunftig, das ist wirklich'); and he ought to be and is the true governor of mankind. There is a reflection in this idealism of the Socratic 'Virtue is knowledge;' and, without idealism, we may remark that knowledge is a great part of power. Plato does not trouble himself to construct a machinery by which 'philosophers shall be made kings,' as in the Republic: he merely holds up the ideal, and affirms that in some sense science is really supreme over human life.

He is struck by the observation 'quam parva sapientia regitur mundus,' and is touched with a feeling of the ills which afflict states. The condition of Megara before and during the Peloponnesian War, of Athens under the Thirty and afterwards, of Syracuse and the other Sicilian cities in their alternations of democratic excess and tyranny, might naturally suggest such reflections. Some states he sees already shipwrecked, others foundering for want of a pilot; and he wonders not at their destruction, but at their endurance. For they ought to have perished long ago, if they had depended on the wisdom of their rulers. The mingled pathos and satire of this remark is characteristic of Plato's later style.

The king is the personification of political science. And yet he is something more than this,—the perfectly good and wise tyrant of the Laws, whose will is better than any law. He is the special providence who is always interfering with and regulating all things. Such a conception has sometimes been entertained by modern theologians, and by Plato himself, of the Supreme Being. But whether applied to Divine or to human governors the conception is faulty for two reasons, neither of which are noticed by Plato:—first, because all good government supposes a degree of co-operation in the ruler and his subjects,—an 'education in politics' as well as in moral virtue; secondly, because government, whether Divine or human, implies that the subject has a previous knowledge of the rules under which he is living. There is a fallacy, too, in comparing unchangeable laws with a personal governor. For the law need not necessarily be an 'ignorant and brutal tyrant,' but gentle and humane, capable of being altered in the spirit of the legislator, and of being administered so as to meet the cases of individuals. Not only in fact, but in idea, both elements must remain—the fixed law and the living will; the written word and the spirit; the principles of obligation and of freedom; and their applications whether made by law or equity in particular cases.

There are two sides from which positive laws may be attacked:—either from the side of nature, which rises up and rebels against them in the spirit of Callicles in the Gorgias; or from the side of idealism, which attempts to soar above them,—and this is the spirit of Plato in the Statesman. But he soon falls, like Icarus, and is content to walk instead of flying; that is, to accommodate himself to the actual state of human things. Mankind have long been in despair of finding the true ruler; and therefore are ready to acquiesce in any of the five or six received forms of government as better than none. And the best thing which they can do (though only the second best in reality), is to reduce the ideal state to the conditions of actual life. Thus in the Statesman, as in the Laws, we have three forms of government, which we may venture to term, (1) the ideal, (2) the practical, (3) the sophistical—what ought to be, what might be, what is. And thus Plato seems to stumble, almost by accident, on the notion of a constitutional monarchy, or of a monarchy ruling by laws.

The divine foundations of a State are to be laid deep in education (Republic), and at the same time some little violence may be used in exterminating natures which are incapable of education (compare Laws). Plato is strongly of opinion that the legislator, like the physician, may do men good against their will (compare Gorgias). The human bonds of states are formed by the inter-marriage of dispositions adapted to supply the defects of each other. As in the Republic, Plato has observed that there are opposite natures in the world, the strong and the gentle, the courageous and the temperate, which, borrowing an expression derived from the image of weaving, he calls the warp and the woof of human society. To interlace these is the crowning achievement of political science. In the Protagoras, Socrates was maintaining that there was only one virtue, and not many: now Plato is inclined to think that there are not only parallel, but opposite virtues, and seems to see a similar opposition pervading all art and nature. But he is satisfied with laying down the principle, and does not inform us by what further steps the union of opposites is to be effected.