“A friend should be a master at guessing and keeping still: you must not want to see everything.”

“You should seek your enemy, you should wage your war - a war for your opinions. And when your opinion is defeated, our honesty should still cry triumph over that!”

“Go up close to your friend but do not go over to him! We should respect the enemy that is in our friend”

“Do you want to go along with others? or go on ahead? or go off on your own?...you must know what you want and that you want. Fourth question for the conscience.”

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

“The author must keep his mouth shut when his work starts to speak.”

“Whoever fights monsters should see to it that in the process he does not become a monster. And if you gaze long enough into an abyss, the abyss will gaze back into you.”