Eleonore Stump argues in her article in this volume that Aquinas’s theory of knowledge is not classical foundationalism, as it has sometimes seemed to be, but, instead, a version of reliabilism. I'm convinced that her thesis is important and well-supported, and it has led me to begin a re-examination of one aspect of Aquinas’s theory of knowledge from the new viewpoint Stump’s work provides. I think the results tend to confirm her account while revealing further details of Aquinas’s reliabilism.My topic (...) is not reliabilism itself. Instead, I am focusing on Aquinas’s account of the reliability of the fundamental operations of the two human cognitive faculties, sense and intellect. Accounts of cognitive reliability have a place in most theories about the justification of belief, of course, and so they are found in more than one sort of epistemology; but reliabilism might be said to need them most. (shrink)