by Scott F. Aikin and Robert B. Talisse
Epistemology is the philosophical study of knowledge. Its main questions are: What do we know?; How do we know it?; and What distinguishes knowledge from lucky guesses, sheer dogmatism, and simple ignorance? The application of this discipline seems pretty obvious in the sense that our answers to these questions will then allow us the means to sort out many of the factual questions before us. A model for knowledge yields a model for inquiry, which, when put in to practice, resolves our disagreements. This is the old school story of the relevance of epistemology. It goes back to Xenophanes, who held in the hymn to progress that even though the gods didn't give us all the truths, we are better off inquiring. This thought runs from the ancient through the modern period to Descartes, who held that his exercises were for the sake of providing a means for philosophy and science to proceed with powerful criteria for progress. And this thought is alive even now with the applications of epistemology by Michael Lynch in his recent In Praise of Reason and Paul Boghossian in his Fear of Knowledge. The Cato Institute's Juan Sanchez's use of the term “epistemic closure” to criticize conservatives for their bad intellectual habits of know-nothingism, too, is in this tradition.
We think the old school story is right, at least in its broad outline. An epistemology is a useful thing to to sort nonsense from the things worth deliberating about; an epistemology is also useful as a guide for deliberation. But there's a problem in the background, and it's one that's regularly been pointed out about a number of high points in the Western tradition. It runs like this: Often, these epistemologies, for all their promise of being deployments of critical thinking, end up being merely dressed-up apologetics for the authors' preferred beliefs. Descartes is regularly the prime target for this criticism – his method was to doubt everything in order to find criteria for truth that could not be doubted; and once he found those criteria, they were used to endorse the core commitments of the Catholic Christianity to which Descartes had ascribed. How convenient, says the critic. And reasonably so.

