This chapter further elucidates PE by explaining how it applies to multiple domains. Though the preceding chapter already touches upon some of these, here it is cashed out how PE can account for perceptual justification, memorial justification, testimonial justification, introspective justification, and a priori justification. Exploring the contours of PE in this way reveals just how powerful and unified the theory is. Along the way, it is argued that Declan Smithies’ forceful objections to PC fail to impugn PE. Additionally, it is shown that PE has the resources to respond to each of the challenges that Smithies claims are faced by any internalist theory with “global ambitions”––any theory that purports to be a comprehensive account of epistemic justification. (These challenges for instance include the problem of forgotten evidence and the problem of stored beliefs.) The discussion in this chapter makes it clear that PE is a comprehensive account of epistemic justification that achieves its global ambitions.
Suppositional Reasoning and Perceptual Justification
