Before the golden age of Greek philosophy there was no Ethics in the strictest sense. Philosophy proper occupied itself primarily with ontological questions--questions as to the origin and constitution of the material world. It was only when mythology and religion had lost their hold upon the cultured, and the traditions of the poets had come to be doubted, that inquiries as to the meaning of life and conduct arose. {36} The Sophists may be regarded as the pioneers of ethical science. This body of professional teachers, who appeared about the fifth century in Greece, drew attention to the vagueness of common opinion and began to teach the art of conduct. Of these Protagoras is the most famous, and to him is attributed the saying, 'Man is the measure of all things.' As applied to conduct, this dictum is commonly interpreted as meaning that good is entirely subjective, relative to the individual. Viewed in this light the saying is one-sided and sceptical, subversive of all objective morality. But the dictum may be regarded as expressing an important truth, that the good is personal and must ultimately be the good for man as man, therefore for all men. 1. It was _Socrates_, however, who, as it was said, first called philosophy from heaven to the sphere of this earth, and diverted men's minds from the consideration of natural things to the affairs of human life. He was indeed the first moral philosopher, inasmuch as that, while the Sophists merely talked at large about justice and virtue, he asked what these terms really meant. Living in an age when the old guides of life--law and custom--were losing their hold upon men, he was compelled to find a substitute for them by reflection upon the meaning and object of existence. For him the source of evil is want of thought, and his aim is to awaken men to the realisation of what they are, and what they must seek if they would make the best of their lives. He is the prophet of clear self-consciousness. 'Know thyself' is his motto, and he maintains that all virtue must be founded on such knowledge. A life without reflection upon the meaning of existence is unworthy of a man.[1] Hence the famous Socratic dictum, 'Virtue is knowledge.' Both negatively and positively Socrates held this principle to be true. For, on the one hand, he who is not conscious of the good and does not know in what it consists, cannot possibly pursue it. And, on the other hand, if a man is once alive to his real good, how can he do otherwise than pursue it? No one therefore does {37} wrong willingly. Let a man know what is right, and he will do it. Knowledge of virtue is not, however, distinct from self-interest. Every one naturally seeks the good simply because he sees that the good is identical with his ultimate happiness. The wise man is the happy man. Hence to know oneself is the secret of well-being. Let each be master of himself, knowing what he seeks, and seeking what he