Universality is the distinguishing mark of genius. There is no such thing as a special genius, a genius for mathematics, or for music, or even for ch… - Otto Weininger

Great men take themselves and the world too seriously to become what is called merely intellectual. Men who are merely intellectual are insincere; they are people who have never really been deeply engrossed by things and who do not feel an overpowering desire for production. All that they care about is that their work should glitter and sparkle like a well-cut stone, not that it should illuminate anything. They are more occupied with what will be said of what they think than by the thoughts themselves.

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.

As the mental endowment of a man varies with the organisation of his accumulated experiences, the better endowed he is, the more readily will he be able to remember his whole past, everything that he has ever thought or heard, seen or done, perceived or felt, the more completely in fact will he be able to reproduce his whole life. Universal remembrance of all its experiences, therefore, is the surest, most general, and most easily proved mark of a genius.