"What is noble? To be able to be alone."

"Love to one only is a barbarity, for it is exercised at the expense of all others. Love to God also!"

"The most common lie is that with which one lies to oneself; lying to others is relatively an exception."

"Objection, evasion, joyous distrust, and love of irony are signs of health; everything absolute belongs to pathology."

"The man of knowledge must be able not only to love his enemies but also to hate his friends."