Fallibility Is No Argument against Reason
A wise man who has practised reasoning knows that he is fallible, and carries this conviction along with him in every judgment he forms. He knows likewise, that he is more liable to err in some cases than in others. He has a scale in this mind, by which he estimates his liableness to err, and by this he regulates the degree of his assent in his first judgment upon any point.... To pretend to prove by reasoning that there is no force in reason, does indeed look like a philosophical delirium. It is like a man's pretending to see clearly, that he himself and all other men are blind. --Thomas Reid, Essays on the Intellectual Powers of Man