In Plato the resultant analysis of the mutual implications of the individual, the social and the natural, converged in the ideas that morals and philosophy are one: namely, a love of that wisdom which is the source of secure and social good; that mathematics and the natural sciences focused upon the problem of the perception of the good furnish the materials of moral science; that logic is the method of the pregnant organization of social conditions with respect to good; that politics and psychology are sciences of one and the same human nature, taken first in the large and then in the little. So far that large and expansive vision of Plato. But projection of a better life must be based upon reflection of the life already lived. The inevitable limitations of the Greek city-state were inevitably wrought into the texture of moral theory. The business of thought was to furnish a substitute for customs which were then relaxing from the pressure of contact and intercourse without and the friction of strife within. Reason was to take the place of custom as a guide of life; but it was to furnish rules as final, as unalterable as those of custom. In short, the thinkers were fascinated by the afterglow of custom. They took for their own ideal the distillation from custom of its essence--ends and laws which should be rigid and invariable. Thus Morals was set upon the track which it dared not leave for nigh twenty-five hundred years: search for _the_ final good, and for _the_ single moral force. Aristotle’s assertions that the state exists by nature, and that in the state alone does the individual achieve independence and completeness of life, are indeed pregnant sayings. But as uttered by Aristotle they meant that, in an isolated state, the Greek city-state, set a garlanded island in the waste sea of _barbaroi_, a community indifferent when not hostile to all other social groupings, individuals attain their full end. In a social unity which signified social contraction, contempt, and antagonism, in a social order which despised intercourse and glorified war, is realized the life of excellence!