Turning back once more from the melancholy decline of a great genius to the splendour of its meridian prime, we will endeavour briefly to recapitulate the achievements which entitle Plato to rank among the five or six greatest Greeks, and among the four or five greatest thinkers of all time. He extended the philosophy of mind until it embraced not only ethics and dialectics but also the study of politics, of religion, of social science, of fine art, of economy, of language, and of education. In other words, he showed how ideas could be applied to life on the most comprehensive scale. Further, he saw that the study of Mind, to be complete, necessitates a knowledge of physical phenomena and of the realities which underlie them; accordingly, he made a return on the objective speculations which had been temporarily abandoned, thus mediating between Socrates and early Greek thought; while on the other hand by his theory of classification he mediated between Socrates and Aristotle. He based physical science on mathematics, thus establishing a method of research and of education which has continued in operation ever since. He sketched the outlines of a new religion in which morality was to be substituted for ritualism, and intelligent imitation of God for blind obedience to his will; a religion of monotheism, of humanity, of purity, and of immortal life. And he embodied all these lessons in a series of compositions distinguished by such beauty of form that their literary excellence alone would entitle them to rank among the greatest masterpieces that the world has ever seen. He took the recently-created instrument of prose style and at once raised it to the highest pitch of excellence that it has ever attained. Finding the new art already distorted by false taste and overlaid with meretricious ornament, he cleansed and regenerated it in that primal fount of intellectual life, that richest, deepest, purest source of joy, the conversation of enquiring spirits with one another, when they have awakened to the desire for truth and have not learned to despair of its attainment. Thus it was that the philosopher’s mastery of expression gave added emphasis to his protest against those who made style a substitute for knowledge, or, by a worse corruption, perverted it into an instrument of profitable wrong. They moved along the surface in a confused world of words, of sensations, and of animal desires; he penetrated through all those dumb images and blind instincts, to the central verity and supreme end which alone can inform them with meaning, consistency, permanence, and value. To conclude: Plato belonged to that nobly practical school of idealists who master all the details of reality before attempting its reformation, and accomplish their great designs by enlisting and reorganising whatever spontaneous forces are already working in the same direction; but the fertility of whose own suggestions it needs more than one millennium to exhaust.