"Victor Reppert's book is a delight on two counts. First, it is a sophisticated and well-informed discussion of C. S. Lewis and his apologetic arguments, demolishing some well-known myths and demonstrating that Lewis had important and serious things to say as a philosopher. Second, and perhaps even more important, Reppert honors Lewis by developing and defending one of Lewis's central arguments against naturalism in a way that is both rigorous and readable, paying attention both to the objections raised against Lewis by Elisabeth Anscombe and to contemporary philosophical debates. This makes the book an important and original contribution to Christian apologetics in its own right."

"According to the standard account, chapter three of C. S. Lewis's Miracles, his argument against naturalism, is a philosophical embarrassment, a beguiling house of cards that collapses at the merest breath of rigorous critique. Victor Reppert, in C. S. Lewis's Dangerous Idea, certainly proves the standard account wrong. But he does more than that: he deepens and extends Lewis's argument against naturalism and makes an intellectually exciting and persuasive case of his own. Reppert's book is philosophical revisionism at its finest."

"One mark of a great apologist is that the apologist's central arguments are reappropriated and refined profitably by later thinkers. One mark of an outstanding Christian philosopher is the ability to do such work in a manner that meets the contemporary demands of philosophical argument. Victor Reppert has accomplished this in this clear, cogent and pertinent defense of the argument from reason. Consider it one more nail in the coffin of naturalism."