In the case of complex personalities the matter stands thus: one of these can understand other men better than they can understand themselves, becaus… - Otto Weininger

The logical axioms are the principle of all truth. These posit an existence towards which all cognition serves. Logic is a law which must be obeyed, and man realises himself only in so far as he is logical. He finds himself in cognition. All error must be felt to be crime. And so man must not err. He must find the truth.

With ordinary men the moments which are united in a close continuity out of the original discrete multiplicity are very few, and the course of their lives resembles a little brook, whereas with the genius it is more like a mighty river into which all the little rivulets flow from afar; that is to say, the universal comprehension of genius vibrates to no experience in which all the individual moments have not been gathered up and stored.

No one can understand himself, for to do that he would have to get outside himself; the subject of the knowing and willing activity would have to become its own object.