Some people argue that inquiry is impossible, because a man can explore neither what he knows nor what he does not know
He cannot explore what he knows, because he knows it, and there is no need to explore it; he cannot explore what he does not know, because he does not know what he is trying to explore
The fallacy of ambiguity: there are two different meanings of knowing: knowing what the answer to the question being explored is and knowing what the question is to explore.