 Reppert first became interested in the argument from reason after a conversion experience at the age of 18.He became aware that while unbelievers like Bertrand Russell claimed to be more rational than believers, Christians like C. S. Lewis claimed not only that their belief is more rational than unbelief, but that the argument from reason shows that the very capacity to reason is itself a reason to think that the naturalism espoused by unbelievers is false.When he read G. E. M. Anscombe's critique of Lewis's argument, Reppert became persuaded that the argument could be formulated in such a way as to overcome Anscombe's objections.