There is likewise a profound saying of Aristotle’s that the individual who otherwise than by accident is not a member of a state is either a brute or a god. But it is generally forgotten that elsewhere Aristotle identified the highest excellence, the chief virtue, with pure thought, and identifying this with the divine, isolated it in lonely grandeur from the life of society. That man, so far as in him lay, should be godlike, meant that he should be non-social, because supra-civic. Plato the idealist had shared the belief that reason is the divine; but he was also a reformer and a radical and he would have those who attained rational insight descend again into the civic cave, and in its obscurity labor patiently for the enlightenment of its blear-eyed inhabitants. Aristotle, the conservative and the definer of what is, gloried in the exaltation of intelligence in man above civic excellence and social need; and thereby isolated the life of truest knowledge from contact with social experience and from responsibility for discrimination of values in the course of life. Moral theory, however, accepted from social custom more than its cataleptic rigidity, its exclusive area of common good, and its unfructified and irresponsible reason. The city-state was a superficial layer of cultured citizens, cultured through a participation in affairs made possible by relief from economic pursuits, superimposed upon the dense mass of serfs, artizans, and laborers. For this division, moral philosophy made itself spiritual sponsor, and thus took it up into its own being. Plato wrestled valiantly with the class problem; but his outcome was the necessity of decisive demarcation, after education, of the masses in whom reason was asleep and appetite much awake, from the few who were fit to rule because alertly wise. The most generously imaginative soul of all philosophy could not far outrun the institutional practices of his people and his times. This might have warned his successors of the danger of deserting the sober path of a critical discernment of the better and the worse within contemporary life for the more exciting adventure of a final determination of absolute good and evil. It might have taught the probability that some brute residuum or unrationalized social habit would be erected into an apotheosis of pure reason. But the lesson was not learned. Aristotle promptly yielded to the besetting sin of all philosophers, the idealization of the existent: he declared that the class distinctions of superiority and inferiority as between man and woman, master and slave, liberal-minded and base mechanic, exist and are justified by nature--a nature which aims at embodied reason.