Over against the Sophists, and the age which has sophisticated them, of which they are the natural product, Plato, being himself of a genius naturally rich, florid, complex, excitable, but adding to the utmost degree of Ionian sensibility an effectual desire towards the Dorian order and askêsis, asserts everywhere the principle of outline, in political and moral life; in the education which is to fit men for it; in the music which is one half of that education, in the philosophy which is its other half--the "philosophy of the ideas," of those eternally fixed outlines of our thought, which correspond to, nay, are actually identical with, the eternally fixed outlines of things themselves. What the difference (difference in regard to continuity and clearness) really is between the conditions of mind, in which respectively the sophistic process, and the genuinely philosophical or dialectic process, as [111] conceived by Plato, leave us, is well illustrated by the peculiar treatment of Justice, its proper definition or idea, in The Republic. Justice (or Righteousness, as we say, more largely) under the light of a comprehensive experience of it, carefully, diligently, adjusted to the nature of man on the one hand, of society on the other, becomes in the fourth book of The Republic, to ta hautou prattein+--to ta hautou prattein.+ There, then, is the eternal outline of Righteousness or Justice as it really is, equally clear and indefectible at every point; a definition of it which can by no supposition become a definition of anything else; impenetrable, not to be traversed, by any possible definition of Injustice; securing an essential value to its possessor, independently of all falsities of appearance; and leaving justice, as it really is in itself, unaffected even by phenomena so misrepresentative of it as to deceive the very gods, or many good men, as happened pre-eminently in the case of Socrates. [112] Here then is the reply of the Platonic Socrates to the challenge that he should prove himself master of a more certain philosophy than that of the people, as represented by the old gnomic poet Simonides, "whom it is hard to disbelieve," (sophos gar kai theios anêr)+ on the one hand; than that of the Sophists on the other, as represented by Thrasymachus. "Show us not only that justice is a better thing than Injustice; but, by doing what (alla ti poiousa)+ to the soul of its possessor, each of them respectively, in and by itself (hautê di' hautên)+ even if men and gods alike mistake it for its contrary, is still the one a good thing, the other a bad one."