Today, October 31, is Reformation Day, a day on which many Protestants commemorate Martin Luther’s nailing of his 95 Theses to the door of the Wittenberg Cathedral on October 31, 1517. Writes Catholic philosopher Peter Kreeft, “The Protestant Reformation began when a Catholic monk rediscovered a Catholic doctrine in a Catholic book. The monk, of course, was Luther; the doctrine was justification by faith; and the book was the Bible.”
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