Of Epistemology
'We know that we know nothing,' they chatter, blanking out the fact that they are claiming knowledge—'There are not absolutes,' they chatter, blanking out the fact that they are uttering an absolute—'You cannot prove that you exist or that you're conscious,' they chatter, blanking out the fact that proof presupposes existence, consciousness and a complex chain of knowledge: the existence of something to know, of a consciousness able to know it, and of a knowledge that has learned to distinguish between such concepts as the proved and the unproved.
Ayn Rand, "Atlas Shrugged"