This article evaluates whether Kant's argument in & sect;IX of the second Critique's Dialectic-that theoretical knowledge of God and immortality would make the highest good practically impossible-would be convincing to a pre-Kantian "dogmatic" metaphysician who affirms this knowledge. Taking Aquinas as an exemplar of pre-Kantian metaphysics, I argue that Kant's argument would not be convincing, since it turns out that Kant begs the question against the dogmatist. Kant therefore lacks this practical reason to reject knowledge of the unconditioned in favour of faith.
