The Jews in the early modern period were curiously dualistic. They often saw the world outside with clearer eyes than it saw itself; but when the Jews turned inward, on themselves, their eyes misted over, their vision became opaque. In the twelfth century Maimonides had tried hard to align Judaism with natural reason. That effort faltered and went underground in the fourteenth century. The ghetto helped to keep it there. It strengthened traditional authority. It discouraged speculation. It made the penalities of communal disapproval much more severe, since a Jew could not leave the ghetto
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