In order to depict a man one must understand him, and to understand him one must be like him; in order to portray his psychological activities one mu… - Otto Weininger

To understand a man is really to be that man.

Most of the time man does not do what he wills, but what he has willed. Through his decisions, he always gives himself only a certain direction, in which he then moves until the next moment of reflection. We do not will continuously, we only will intermittently, piece by piece. We thus save ourselves from willing: principle of the economy of the will. But the higher man always experiences this as thoroughly immoral.

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.

That is why man can also never understand himself: For he is himself a timeless act; an act which he performs continuously, and there is no moment in which he might not perform it, as there would have to be to understand himself.