Prodicus, whom Plato himself esteemed, appears to have been principally preoccupied with the moral problem. He was the author of the famous apologue which represented Hercules having to choose between two paths, the one being that of virtue, the other of pleasure. Like Socrates later on, he too was subject to the terrible accusation of impiety, and underwent capital punishment. The Sophists furnish the most important epoch in the history of ancient philosophy; until their advent the philosophic systems were great poems on the total of all things, known and unknown. The Sophists opposed these ambitious and precipitate generalizations, in which imagination had the larger share, and their discovery was to bring philosophy back to its true starting point by affirming that the first thing to do, and that before all else, was to know our own mind and its mechanism. Their error possibly was, while saying that it was the first thing to do, too often to affirm that it was the only thing to do; still the fact remains that they were perfectly accurate in their assurance that it was primary. CHAPTER III SOCRATES Philosophy Entirely Reduced to Morality, and Morality Considered as the End of all Intellectual Activity. THE PHILOSOPHY OF SOCRATES.--Of Socrates nothing is known except that he was born at Athens, that he held many public discussions with all and sundry in the streets of Athens, and that he died under the Thirty Tyrants. Of his ideas we know nothing, because he wrote nothing, and because his disciples were far too intelligent; in consequence of which it is impossible to know if what they said was thought by him, had really been his ideas or theirs. What seems certain is that neither Aristophanes nor the judges at the trial of Socrates were completely deceived in considering him a Sophist; for he proceeded from them. It is true he proceeded from them by reaction, because evidently their universal scepticism had terrified him; but nevertheless he was their direct outcome, for like them he was extremely mistrustful of the old vast systems of philosophy, and to those men who pretended to know everything he opposed a phrase which is probably authentic: "I know that I know nothing;" for, like the Sophists, he wished to recall philosophy to earth from heaven, namely from metaphysics to the study of man, and nothing else; for, like the Sophists, he confined and limited the field with a kind of severe and imperious modesty which was none the less contemptuous of the audacious; for, finally, like the Sophists, but in this highly analogous to many philosophers preceding the Sophists, he had but a very moderate and mitigated respect for the religion of his fellow-citizens.