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 of reason against the usurpations of authority. The object of his Essay on the Human Understanding (1690) is to show that all knowledge is derived from experience. He subordinated faith completely to reason. While he accepted the Christian revelation, he held that revelation if it contradicted the higher tribunal of reason must be rejected, and that revelation cannot give us knowledge as certain as the knowledge which reason gives. "He that takes away reason to make room for revelation puts out the light of both; and does much what the same as if he would persuade a man to put out his eyes, the better to receive the remote light of an invisible star by a telescope." He wrote a book to show that the Christian revelation is not contrary to reason, and its title, The Reasonableness of Christianity, sounds the note of all religious controversy in England during the next hundred years. Both the orthodox and their opponents warmly agreed that reasonableness was the only test of the claims of revealed religion. It was under the direct influence of Locke that Toland, an Irishman who had been converted from Roman Catholicism, composed a sensational book, Christianity Not Mysterious (1696). He assumes that Christianity is true and argues that there can be no mysteries in it, because mysteries, that