“He who fights with monsters should look to it that he himself does not become a monster. And when you gaze long into an abyss the abyss also gazes into you.”
Aphorism 146 from Jenseits von Gut und Böse (Beyond Good and Evil) an 1886 book by the German philosopher Friedrich Nietzsche.
Translated from: Wer mit Ungeheuern kämpft, mag zusehn, dass er nicht dabei zum Ungeheuer wird. Und wenn du lange in einen Abgrund blickst, blickt der Abgrund auch in dich hinein.
Source: Gutenberg-DE
Translation source: Hollingdale
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Friedrich Nietzsche 655
German philosopher, poet, composer, cultural critic, and cl… 1844–1900Related quotes

Variant: 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 fight monsters must take care that he doesn't become one himself.”
Variant: A German philosopher once wrote that he who fights monsters must take care that he doesn't become one himself.
Source: Scorpia Rising


“And when the abyss looks into you - and it will - may you look back unflinching.”
Source: Challenger Deep
“Someday, he thought, I would like to meet a monster who looked like a monster.”
The Boys from Brazil (1976)