I will not revert to the political speculations of Plato, which belong to another part of my subject. My present concern is with his theology and his metaphysic. Is it any wonder that the early Christian thinkers, such as Saint Augustine, delighted in him and called him the Attic Moses? In his _Republic_ he goes so far as to propose for his ideal state the expulsion of Homer and the other Epic poets, and the establishment of a loftier creed, as necessary for pure and sound morals. The true deity must be one, and the author of all good. He must be free from all disturbance of passion or caprice, without love or jealousy, without pride or interest. Any defects there may be in the world are due, not to his want of benevolence, but to his want of omnipotence in controlling the necessities of things, or perhaps rather because no being, omnipotent or not, can possibly be conceived as reconciling absolute contradictories. It may, for example, be better and nobler for the creation that beings should exist which have a free will of their own and which are not like machines controlled by invincible necessity. But if they have indeed free will, how is it possible they should not go wrong, and cause evil in the world as the outcome of their liberty? Yet if this be the cause of evil in the world, it implies a higher and better state than one of perfect order, with the ideas of virtue and merit expunged from existence. Plato goes further than any but the highest Christian theologians when he declares the Moral Law to be eternal and immutable, and to be binding even on the Author of the universe. In other words, the great mediæval controversy,--whether God does a thing because it is right, or whether a thing must be right because God does it,--this controversy is solved in the sense of what the Cambridge Platonists have called Immutable Morality. If such be the obligation under which even the Deity acts, it is an obvious corollary that nothing in the conduct of men is comparable to justice, nothing in dignity equal to the obeying of the Moral Law, without any regard of consequences. Nay more, to be punished for wrong-doing is far happier and better than to escape the consequences, and so to miss the great lesson that crime brings with it misery as a just consequence. Accordingly, a clear knowledge of moral principles is of the first moment to all men, and in Plato’s day it was often a more difficult problem to choose the right course, than to follow it when discovered. This is the meaning of those many researches into the proper connotation of terms expressing moral ideas. What is _justice_, what is _temperance_, what is _chastity_, what is _holiness_? On all these, there was little difficulty in showing by discussion that the popular notions were vague, and often self-contradictory. The first step to a purer life was to understand its conditions, to bring the intellect, as well as the will, to bear upon the conduct of men. Hence a man who felt