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 unbeliever. The political enemies of Pericles struck at him by attacking his friend. They introduced and carried a blasphemy law, to the effect that unbelievers and those who taught theories about the celestial world might be impeached. It was easy to prove that Anaxagoras was a blasphemer who taught that the gods were abstractions and that the sun, to which the ordinary Athenian said prayers morning and evening, was a mass of flaming matter. The influence of Pericles saved him from death; he was heavily fined and left Athens for Lampsacus, where he was treated with consideration and honour.

Other cases are recorded which show that anti-religious thought was liable to be persecuted. Protagoras, one of the greatest of the Sophists, published a book On the Gods, the object of which seems to have been to prove that one cannot know the gods by reason. The first words ran: "Concerning the gods, I cannot say that they exist nor yet that they do not exist. There are more reasons than one why we cannot know. There is the obscurity of the subject and there is the brevity of human life." A charge of blasphemy was lodged against him and he fled from Athens. But there was no systematic policy of suppressing free thought. Copies of the work of Protagoras were collected and