“And when the abyss looks into you - and it will - may you look back unflinching.”
Source: Challenger Deep
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Neal Shusterman 122
American novelist 1962Related quotes

“When you stare into the abyss the abyss stares back at you.”
Variant: When you look into an abyss, the abyss also looks 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
Misattributed

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.