Plato has exerted a greater influence over human thought than any other individual with the possible exception of Aristotle; this is due both to the intrinsic vitality of his ideas and to the fact that he appears at a comparatively early state in Western culture. His ideas affect the intellectual climate of our day in two important ways: first, by entering into our Christian theology and contributing especially to its doctrine of the opposition between the spirit and the flesh; secondly, by entering into our scientific mentality. Contents: Apology; Crito; Protagoras; Gorgias; Phaedo; Ion; Symposium; Phaedrus; Theaetetus; Parmenides; Philebus; Timaeus; Laws.