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 w… - Otto Weininger

Colour-blindness always extends to the complementary colours. Those who are red blind are also green blind; those who are blind to blue have no consciousness of yellow. This law holds good for all mental phenomena; it is a fundamental condition of consciousness.

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.

The deepest, the intelligible, part of the nature of man is that part which does not take refuge in causality, but which chooses in freedom the good or the bad.