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 the way for the educationalists who were known as the Sophists. They begin to appear after the middle of the fifth century. They worked here and there throughout Greece, constantly travelling, training young men for public life, and teaching them to use their reason. As educators they had practical ends in view. They turned away from the problems of the physical universe to the problems of human life—morality and politics. Here they were confronted with the difficulty of distinguishing between truth and error, and the ablest of them investigated the nature of knowledge, the method of reason—logic—and the instrument of reason—speech. Whatever their particular theories might be, their general spirit was that of free inquiry and discussion. They sought to test everything by reason. The second half of the fifth century might be called the age of Illumination.

It may be remarked that the knowledge of foreign countries which the Greeks had acquired had a considerable effect in promoting a sceptical attitude towards authority. When a man is acquainted only with the habits of his own country, they seem so much a matter of course that he ascribes them to nature, but when he travels abroad and finds totally different habits and standards of conduct prevailing, he begins to understand