Catholic philosopher G.E.M. Anscombe debated Lewis about a portion of Lewis's 1947 book, "Miracles" known today as the Argument from Reason, in which he stated that since naturalists claimed all of nature to be irrational, that would make the claim of the naturalists also irrational and therefore contrary to reason (for example, that if there is no God, if nature is the product of chance, then how can a human brain offer anything but chance observations that have no authority?). She claimed that he had mistakenly equated non-rational causes with irrational causes and confused the concepts of cause, reason, and explanation. John R. Lucas later helped in a rerun of this debate, which ended up vindicating Lewis. Victor Reppert's book, "C.S. Lewis's Dangerous Idea", further supports Lewis's original argument.