A man is first reverent about himself, and self-respect is the first stage in reverence for all things. - Otto Weininger

In the case of complex personalities the matter stands thus: one of these can understand other men better than they can understand themselves, because within himself he has not only the character he is grasping, but also its opposite. Duality is necessary for observation and comprehension.

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.

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.