There is, moreover, very little sense in preventing young people from giving expression to their ideas on the pretext that they have less experience … - Otto Weininger

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 must be able to reproduce them in oneself. To understand a man one must have his nature in oneself.

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.

In men of genius, sterile years precede productive years, these again to be followed by sterility, the barren periods being marked by psychological self-depreciation, by the feeling that they are less than other men; times in which the remembrance of the creative periods is a torment, and when they envy those who go about undisturbed by such penalties. Just as his moments of ecstasy are more poignant, so are the periods of depression of a man of genius more intense than those of other men [Wie seine Ekstasen gewaltiger sind als die der anderen, so sind auch seine Depressionen fürchterlicher]. Every great man has such periods, of longer or shorter duration, times in which he loses self-confidence, … times in which, indeed, he may be sowing the seeds of a future harvest, but which are devoid of the stimulus to production.