Among the things that can drive a thinker to despair is the knowledge that the illogical is necessary for man and that much good comes from it. It is so firmly lodged in the passions, in speech, in art, in religion, and generally in everything which endows life with value, that one cannot extricate it without doing irreparable harm to these beautiful things. Only the very naive are capable of thinking that the nature of man can be transformed into a purely logical one; but, if there were degrees of approximation to this goal, how much would not have to vanish along this path! Even the most rational man needs nature again from time to time, that is, his illogical basic attitude to all things.