The Argument from Reason Revisited

Arguments against naturalism and materialism have a long history, from Plato to Plantinga. The paper has three parts: First, I reconstruct an argument from reason found in Plato’s the Phaedo. Second I consider whether the argu‑ ment is relevant to contemporary forms of naturalism. I argue that the argument does constitute a serious objection to some forms of naturalism. I then defend the argument against objections from GEM Anscombe, Graham Oppy, and Peter van Inwagen.