Abstract

Those who endorse a knowledge-first program in epistemology claim that rather than attempting to understand knowledge in terms of more fundamental notions or relations such as belief and justification, we should instead understand knowledge as being in some sense prior to such concepts and/or relations. If we suppose that this is the correct approach to theorizing about knowledge, we are left with a residual question about the nature of those concepts or relations, such as justification, that were thought to be first but are now second. Jonathan Jenkins Ichikawa has recently proposed that we understand justification in terms of potential knowledge. Ichikawa combines his view of knowledge and justification with what initially seems to be a natural complement, epistemological disjunctivism. While Ichikawa focuses on hallucination, I shift the focus to illusion. I argue that the combination of justification as potential knowledge and epistemological disjunctivism entails that perceptual beliefs that arise from illusions are not justified.