Thus in what we may call the earliest justification of liberty of thought we have two significant claims affirmed: the indefeasible right of the conscience of the individual a claim on which later struggles for liberty were to turn; and the social importance of discussion and criticism. The former claim is not based on argument but on intuition; it rests in fact on the assumption
[35] of some sort of superhuman moral principle, and to those who, not having the same personal experience as Socrates, reject this assumption, his pleading does not carry weight. The second claim, after the experience of more than 2,000 years, can be formulated more comprehensively now with bearings of which he did not dream.
The circumstances of the trial of Socrates illustrate both the tolerance and the intolerance which prevailed at Athens. His long immunity, the fact that he was at last indicted from political motives and perhaps personal also, the large minority in his favour, all show that thought was normally free, and that the mass of intolerance which existed was only fitfully invoked, and perhaps most often to serve other purposes. I may mention the case of the philosopher Aristotle, who some seventy years later left Athens because he was menaced by a prosecution for blasphemy, the charge being a pretext for attacking one who belonged to a certain political party. The persecution of opinion was never organized.
It may seem curious that to find the persecuting spirit in Greece we have to turn to the philosophers. Plato, the most brilliant disciple of Socrates, constructed in his later years an ideal State. In this State he instituted
[36] a religion considerably different from the current religion, and proposed to compel all the citizens to believe in his gods on pain of death or imprisonment. All freedom of discussion was excluded under the cast-iron system which he conceived. But the point of interest in his attitude is that he did not care much whether a religion was true, but only whether it was morally useful; he was prepared to promote morality by edifying fables; and he condemned the popular mythology not because it was false, but because it did not make for righteousness.