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 enchained in the prison which Christianity had built around the human mind. It was not indeed inactive, but its activity took the form of heresy; or, to pursue the metaphor, those who broke chains were unable for the most part to scale the walls of the prison; their freedom extended only so far as to arrive at beliefs, which, like orthodoxy itself, were based on Christian mythology. There were some exceptions to the rule. At the end of the twelfth century a stimulus from another world began to make itself felt. The philosophy of Aristotle became known to learned men in Western Christendom; their teachers were Jews and Mohammedans. Among the Mohammedans there was a certain amount of free thought, provoked by their knowledge of ancient Greek speculation. The works of the freethinker Averroes (twelfth century) which were based on Aristotle's philosophy, propagated a small wave of rationalism in Christian countries. Averroes held the eternity of matter and denied the immortality of the soul; his general view may be described as pantheism. But he sought to avoid difficulties with the orthodox authorities of Islam by laying down the doctrine of double truth, that is the coexistence of two independent and contradictory truths, the one philosophical, and the other religious. This