The conversations glide from this destructive analysis into a constructive philosophy, and then we soon feel that it is Plato rather than Socrates whom we are getting. The great contribution of Socrates himself to philosophy is the attitude he impressed--of inquiry which is serious because seeking the foundations of virtue and happiness, and is inexorable in its insistence on nothing less than solid reality. Against all allurements of indolence, comfort, and social convention he presses the question, What is _true_? His characteristic word is: "Some things, Meno, I have said of which I am not altogether confident. But that we shall be better and braver and less helpless if we think that we ought to inquire than we should have been if we indulged in the idle fancy that there was no knowing and no use in searching after what we know not; that is a theme upon which I am ready to fight, in word and deed, to the utmost of my power." Plato took from Socrates not method but inspiration, and soared into speculation. He wrote over the door of the Academy, "Let no one enter here who does not know geometry." That is, you are first to acquire absolute confidence, by familiarity with the demonstrations of mathematics, that real and certain knowledge is accessible to the human mind. Thus planting his foot on firmest certainty, Plato leaps off into a glorious sea of clouds. Flashes of insight and sublime allegory mix with fantastic theory and word-play. The vast range of his thought we will touch only at two points. In the Symposium and the Phaedrus he discusses in his most brilliant vein the problem of love. To the reader who has inherited the ethical ideal of Christianity, Plato's love will seem like the image in Nebuchadnezzar's vision,--the head of gold, the feet of miry clay. He has a toleration for some aspects of sensuality of which Paul said, "it is a shame even to speak;" and this tolerance, in the greatest of the classic philosophers, is the most pregnant suggestion of the cleansing work which it was left for Christianity to undertake. Yet Plato teaches most impressively the subordination of sense to spirit in love, and the struggle of the two in man has seldom been set forth more powerfully than in his figure of the two yoked horses: the white, celestial steed struggling upward; the black, unruly one plunging down, while Reason, the charioteer, strives to guide. In the description of Love which Socrates professes to quote from the wise woman of Mantineia, there is the very height of the Platonic philosophy,--the gradual sublimation of human passion to the recognition of all noble forms and ideas, and at last to the vision of the Divine Beauty which is one with Wisdom and with Love.