When you dream, your perceptual (and other) competence is affected. You are then unable to get it right competently with the beliefs in your dream.
Ernest SosaUltimately, my more significant agreement is with a virtue tradition that features Aristotle and Descartes.
Ernest SosaThe correctness of much testimonially based belief is no more than minimally creditable to the believer.
Ernest SosaIn arriving at the relevant theory about the specifics of our faculty of vision we will presumably use our eyes to gather relevant data. Based on such data we come to know about the optic nerve, the structure of our eyes, the rods and cones, etc., so as to explain how it is that vision gives us reliable access to the shapes and colors of objects around us. In reliably arriving at that theory we thus exercise the very faculty whose reliability is explained by the theory. There is no vice in this sort of circularity.
Ernest Sosa