Another group of men contributed to the intellectual life of that wonderful fifty years of Athenian history which began with the defeat of the Persians and ended with the outbreak of the Peloponnesian War. How keen the intellectual life of that time was is shown by the high excellence of the plays to which the masses of the common citizens listened in the theater. Aeschylus, Sophocles, and Euripides were not enjoyed by the few but by the great body of Athenian citizens, and their plays were known even among the remote Greek colonies. The intellectual spirit of the age was stimulated to inquiry and to scepticism. Herodotus is wholly sceptical, and the agnostic tendency of the time is shown by the entire lack of mythology and superstition displayed by Thucydides. A further stimulus was furnished by the development of a higher education given by professional teachers—the Sophists.

The last half of the fifth century is often called with good reason the “Age of the Sophists.” We must understand clearly just what we mean by this term as applied to the men of this time, for today the word sophist has an unfavorable connotation. The Sophists of the fifth century neither formed a philosophic school nor were they charlatans. The most prominent among them was Protagoras of Abdera whose ability and character is shown by the fact that Pericles selected him to draw up the laws for Thurii in 444-43 b.c. Gorgias of Leontini in Sicily enjoyed such high reputation that in 427 he was sent at the head of an embassy to Athens. These Sophists were simply men devoted to the pursuit of wisdom, frequently professional teachers who undertook to give a general culture, to train their pupils to take part in society and the state. For the old training which had been gained by observation they substituted a formal discipline; they offered instruction in rhetoric, politics, music, in short in all the higher branches, as we should call them. But they had no unity of doctrine. By the close of the fifth century they had fallen somewhat into disrepute and were under suspicion, since in the Athenian state all the youths who could afford to pay the fees which these professional teachers charged belonged to the aristocratic class, which frequently voted against the democracy. The Sophists owed their great influence to the fact that they met an actual need in the small society of Athens which included an unusual number of men with eager alert minds and great intellectual curiosity. Now it should be observed that rhetoric, which formed a considerable part of the new education introduced by these professional teachers since political life was the chief career open to a young Athenian, led to habits of examination, analysis, and definition. We are all familiar with the fact that any attempt to analyze and define customary beliefs and practices is pretty certain to detect inconsistencies unobserved before; to lead, at first at least, to confusion and to doubt as to the validity of the practice or belief under consideration; and that when applied to traditional morality or religion it is likely to loosen the obligations which men have hitherto regarded. For illustrations of this truth we have only to look about us and to see how in this generation, as in the generations of our fathers, long accepted beliefs have crumbled before examination, as for example the institution of slavery, the justice of which few questioned a century and a quarter ago. So it was inevitable that in Athens some of the effects of the sophistic teaching should be destructive. And these effects were exaggerated by the great store which was set on skill in disputation. When moral or religious themes were under discussion, the point at issue was not the value of this or that position, but rather the relative skill of the disputants. We are so familiar with this in academic life, in college debates, for example, that the question of the moral effect does not rise in our minds. But it is little wonder that in the fifth century in Athens the Sophists were charged with making the worse cause the better.

Furthermore the Sophists were sceptical as to the possibility of acquiring absolute knowledge about anything. This scepticism may have been due to a failure on the part of the science of the day which led individuals to turn from nature to man as the object of their inquiry. Protagoras maintained that all knowledge was relative, since the only way in which a man can know anything is through his senses; through them he perceives that an object is hot or cold, round or square, sweet or bitter. He pointed out, also, that the same object will not always appear the same even to the same individual; hence he declared that there is no such thing as absolute truth, but that whatever seems true to you or to me at the moment is the truth for you or for me, and that it is not at all necessary that you and I should hold the same thing to be true at one and the same time. Whatever seems to the individual true is true, according to him. From this came his famous dictum that man, that is the individual, is the measure of all things.[161] It is clear that this doctrine when applied to politics, morals, or religion was upsetting.

So long as men studied nature, they were concerned with discovering the inflexible laws which govern the world. But when they turned their attention from nature to society or government, they realized that human institutions seemed to be the result on the whole of conventions agreed upon and adopted by mankind. The Sophists held in general that the form of the state, the current moral and religious beliefs and social customs had no absolute validity; that they were the results of convention; and that their only warrant was that they worked well in practice, that they were profitable to the individual and to society. This pragmatic view of institutions fell in well with the temper of the last half of the fifth century, both in the period of Athens’ imperial supremacy and in the time of her trial during the Peloponnesian War, when in passion or despair the people disregarded law and, as in the case of the Melians, all that humanity had counted sacred. It was an age when many held that might and right were identical, and for this view the Sophists, even though unwittingly, furnished arguments; for if the test of an institution or act is that it works well when put into practice, success proves validity. The Sophists, too, taught that virtue (ἀρετή) was nothing else than what we call today efficiency. It is not strange that the conservative Athenians came to look on them with suspicion.

With regard to the gods Protagoras was naturally agnostic. He began his “Treatise on the Gods” with the words: “So far as the gods are concerned, I cannot know whether they exist or do not exist; or what their nature is. Many things prevent our knowing. The matter is obscure and life is short.”[162] One may be curious to know what large matter Protagoras found for his discussion when he began with this frank confession of ignorance; but it should be observed that in this confession there is nothing necessarily antagonistic to the popular theology of his day. It only shows what the words plainly declare, that a belief in the gods cannot depend upon knowledge. Another Sophist, Prodicus, maintained that the divinities were nothing but the kindly powers of nature which man had deified;[163] and the “Gentle Critias,” one of the worst of the Thirty Tyrants, and a ready pupil of the earlier Sophists, is said to have set forth in a satyric drama the theory that the gods were the clever invention of someone who wished to scare men out of their desire to do evil.[164] The effect of such scepticism and agnosticism we can easily imagine.

Many things had been wrongly laid at the door of the Sophists, but it is small wonder that the conservative Athenian citizens came to look with distrust and alarm on these new-fangled subversive notions; that they banished Protagoras and burned his books in the market place; or finally that they should have put Socrates to death.

Into this age of intellectual ferment and readjustment, of scepticism and eager inquiry, the age of Anaxagoras and the Sophists, Socrates entered. He was at once the child of his time and the greatest fecundator of men’s minds that Europe had yet known. He was born in 469 b.c. and was forced to drink the hemlock in March, 399, so that he had completed the allotted span of life. The son of a sculptor, we are told that he followed his father’s profession in his youth, but apparently he did not continue this long. Whence he derived the means of livelihood we do not know. He received the regular Athenian education, was interested especially in geometry and astronomy; the works of the philosophers he had read, but professed that he gained little from them. One is tempted to dwell on the picturesque characteristics of this man—his refusal to teach for pay, as did the ordinary teachers, his profession of complete ignorance—his only claim to wisdom, he said himself,—his ugliness of feature, and his beauty of soul, his omnivorous interest in the work of the humble craftsmen, above all on his belief that he had a warning spirit, a daemon, which checked him when his course was wrong. Although in obedience to this inward monitor Socrates refrained from politics, he fulfilled all his civic duties in peace and in war. He conformed to the traditional religion, sacrificing and praying to the traditional gods, although he undoubtedly did not hold that they were the limited and sensual creatures of the popular belief. When he prayed he asked not for gold or silver or power, but for what the gods knew was good for him. At the close of Plato’s Phaedrus he offers this appeal: “Beloved Pan, and all ye other gods who haunt this place, grant me beauty of the inward soul, and make the outward and the inward man to be but one.” This was the man who was charged with corrupting the youth of Athens.

Socrates had much in common with the Sophists. Although it is evident that in his earlier years he had been interested in physical science, we know that he turned away from that in the course of time, convinced that man alone was more than man could understand. He rather confined his attention to man himself, and made man and his conduct the center of philosophic inquiry. With the Sophists Socrates held that the cultivation of excellence, of virtue, whatever that might be, was the chief thing. He also identified virtue and knowledge, and like the Sophists was sceptical as to man’s ability to attain absolute knowledge. Practicability was the test he applied to various opinions. If one notion as to the state or society or anything else worked better than another, it was, therefore, in his view the better; and according to him it was by the adoption of such useful opinions that the individual became the wiser man. He held that education does not consist in putting things into people’s heads, but in leading them to discover the truths which they already possess. He therefore employed discussion as to the validity of hypotheses to bring out the latent knowledge in the minds of his young friends. This method of his—dialectic—was not identical with that of the Sophists apparently, but was not unlike theirs. It was, therefore, natural that his own time should have reckoned him as one of the professional class.

How then was he distinguished from these Sophists? Externally, first of all, by the fact that he did not teach for pay, that his purpose was unselfish, his interest being solely the elucidation of truth and so the establishment of virtue. He himself believed that he had a divine commission to serve the Athenians as a missionary. Plato makes him declare in his defence before his judges: “Men of Athens, I should be guilty of a crime indeed if through fear of death or anything else I should desert the post to which I am assigned by the god. For the god ordains ... that I should follow after wisdom and examine myself and others.”[165] He conceived of himself as the physician of the soul, and maintained that his whole business was “to persuade all, both young and old, not to care about the body or riches, but first and foremost about the soul—how to make the soul as good as possible.”[166]

As I have already said, he believed that if men could only know what justice, goodness, and temperance were they would naturally and inevitably be just and good and temperate. Vice he thought was due to a lack of knowledge; therefore he employed his questioning, dialectic, to endeavor to secure clear definitions of these and other virtues, for he was convinced that if only he and his associates could discover what virtue was, they would at once pursue virtue and flee from all wrongdoing. We may smile at the naïveté of this belief, that virtue is something that can be taught, that to be practised it needs only to be seen; but we must remind ourselves that his confidence was based on another belief, which was that virtue is the best and the most profitable for the individual; and that since each man desires the best for himself, if he sees what is right, he will follow that course unswervingly to the end. It may be said with reason that this is a utilitarian view, and so it is; but in Socrates it was combined with a power of will which enabled him to translate his convictions into reality, for it was in obedience to this conviction that the great teacher gave up his life.