Wright intends rational acceptance of presuppositions to answer the skeptic about knowledge and epistemic justification, not merely to serve practical interests.

A final view of a priori justification according to which it does not rest on nonexperiential evidence holds that we are entitled to accept certain propositions on no evidence and that entitlement on no grounds or evidence is what a priori justification amounts to. To be entitled to accept, or trust, some presupposition is for it to be rational to accept or trust it, though this is supposed to be different from being justified in believing it. Crispin Wright proposes that the laws of logic and t