The same fundamental difference comes out strongly in their respective theologies. Plato starts with the conception that God is good, and being good wishes everything to resemble himself; an assumption from which the divine origin and providential government of the world are deduced. Aristotle thinks of God as exclusively occupied in self-contemplation, and only acting on Nature through the love which his perfection inspires. If, further, we consider in what relation the two philosophies stand to ethics, we shall find that, to Plato, its problems were the most pressing of any, that they haunted him through his whole life, and that he made contributions of extraordinary value towards their solution; while to Aristotle, it was merely a branch of natural history, a study of the different types of character to be met with in Greek society, without the faintest perception that conduct required to be set on a wider and firmer basis than the conventional standards of his age. Hence it is that, in reading Plato, we are perpetually reminded of the controversies still raging among ourselves. He gives us an exposition, to which nothing has ever been added, of the theory now known as Egoistic Hedonism; he afterwards abandons that theory, and passes on to the social side of conduct, the necessity of justice, the relation of private to public interest, the bearing of religion, education, and social institutions on morality, along with other kindred topics, which need not be further specified, as they have been discussed with sufficient fulness in the preceding chapter. Aristotle, on the contrary, takes us back into old Greek life as it was before the days of Socrates, noticing the theories of that great reformer only that he may reject them in favour of a narrow, common-sense standard. Virtuous conduct, he tells us, consists in choosing a mean between two extremes. If we ask how the proper mean is to be discovered, he refers us to a faculty called φρόνησις, or practical reason; but on further enquiry it turns out that this faculty is possessed by none who are not already virtuous. To the question, How are men made moral? he answers, By acquiring moral habits; which amounts to little more than a restatement of the problem, or, at any rate, suggests another more difficult question—How are good habits acquired?