 The most notable norm of naturalized epistemology actually coincides with that of traditional epistemology. It is simply the watchword of empiricism: nihil in mente quod non prius in sensu. This is a prime specimen of naturalized epistemology, for it is a finding of natural science itself, however fallible, that our information about the world comes only through the impact of our sensory receptors. And still the point is normative, warning us against telepaths and soothsayers. (Quine 1992: 19)