The QOTD, on the epistemology of faith:

“Compare belief of this sort [i.e., faith] with the a priori and memory beliefs I spoke of above. In a certain sense, there isn’t anything to go on in any of the three cases. You don’t accept memory and obvious a priori beliefs on the basis of other beliefs; but you also lack the detailed phenomenological basis, the rich and highly articulated sensuous imagery that is involved in perception. What you do have in all three cases is another kind of phenomenal evidence, what I have been calling doxastic evidence… There is a certain kind of phenomenology that distinguishes entertaining a proposition you believe from one you do not: the former simply seems right, correct, natural, approved - the experience isn’t easy to describe. You have this doxastic evidence in all three sorts of cases (as, indeed, in any case of belief), and you have nothing else to go on. But you don’t need anything else to go on…”

– Alvin Plantinga, Warranted Christian Belief (available online for free, here), pg. 264.