“What does your conscience say? — 'You should become the person you are'.”

“The person who fights monsters should make sure that in the process, he does not become a monster himself. Because when you stare down at an abyss, the abyss stares back at you.”

“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.”

“He who fights with monsters should look to it that he himself does not become a monster . . . when you gaze long into the abyss the abyss also gazes into you”

“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.”

“You say 'I' and you are proud of this word. But greater than this- although you will not believe in it - is your body and its great intelligence, which does not say 'I' but performs 'I'.”

“God is a conjecture; but I desire that your conjectures should be limited by what is thinkable. Can you think a god? [...] You should think through your own senses to their consequences.”