The essential thing ‘in heaven and earth’ is that there should be a long obedience in the same direction; there thereby results, and has always resulted in the long run, something which has made life worth living.

When you gaze long into the Abyss of Sustainability, the Abyss of Sustainability also gazes into you.

O Voltaire! O humanity! O idiocy! There is something ticklish in "the truth," and in the SEARCH for the truth; and if man goes about it too humanely-"il ne cherche le vrai que pour faire le bien"-I wager he finds nothing!

One does not kill by anger but by laughter.

He who has always spared himself much will in the end become sickly of so much consideration. Praised be what hardens!

One hears but one does not seek; one takes -- one does not ask who gives; a thought flashes up like lightning, it comes of necessity and unfalteringly formed.

Man is something that shall be overcome.... Man is a rope, tied between beast and overman -- a rope over an abyss... What is great in man is that he is a bridge and not an end.