Jealous is every virtue of the others, and a dreadful thing is jealousy. Even virtues may succumb by jealousy.

This is the fundamental idea of culture, insofar as it sets but one task for each of us: to further the production of the philosopher, of the artist, and of the saint within us and outside us, and thereby to work at the consummation of nature.

Sensuality often hastens the "Growth of Love" so much that the roots remain weak and are easily torn up.

In revenge and in love, woman is more barbarous than man.

What was a lie in the father becomes a conviction in the son.

Conversation with a friend will only bear good fruit of knowledge when both think only of the matter under consideration and forget that they are friends.

History is nothing more than the belief in the senses, the belief in falsehood.