"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."
— Mark Twain

January 1, 1970

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Original Language: English

Sources

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