The condition that gives birth to a rule is not the same as the condition to which the rule gives birth.

We must be cruel as well as compassionate: let us guard against becoming poorer than nature is!

The philosopher believes that the value of his philosophy lies in the whole, in the building: posterity discovers it in the bricks with which he built and which are then often used again for better building: in the fact, that is to say, that building can be destroyed and nonetheless possess value as material.

Men were considered "free" only so that they might be considered guilty - could be judged and punished: consequently, every act had to be considered as willed, and the origin of every act had to be considered as lying within the consciousness (and thus the most fundamental psychological deception was made the principle of psychology itself).

Character is determined more by the lack of certain experiences than by those one has had.

For let us not underestimate the Christian: the Christian, false to the point of innocence, is far above the ape-regarding Christians, a well known theory of descent becomes a mere compliment.

One must learn to love oneself with a wholesome and healthy love, so that one can bear to be with oneself and need not roam.