The Enlightenment was the culmination of a vision that had been long in the making. It built on Galileo’s mechanistic science, Descartes’ quest for autonomous certainty, and Newton’s cosmic laws, and by the eighteenth century, the philosophes believed that they had acquired a uniform way of assessing the whole of reality. Reason was the only path to truth. The philosophes were convinced that religion, society, history, and the workings of the human mind could all be explained by the regular natural processes discovered by science. But their rational ideology was entirely dependent upon the
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