Abstract

In “A Priori Knowledge,” Albert Casullo asks whether there is a priori knowledge. He ultimately defines a priori knowledge as true belief with a priori justification, where a belief is a priori justified if it is nonexperientially justified. Armed with this definition, Casullo evaluates several traditional arguments for and against the existence of a priori knowledge. He concludes that the traditional arguments reach an impasse by arguing on a priori grounds that the opposite position is deficient. A successful way to defend a priori knowledge, he argues, would be to find empirical evidence that supports the existence of nonexperiential sources of justification.