Who resonated and how with nietzsche's quote "He who fights with monsters should see to it that he himself does not become a monster. And if you gaze?

"He who fights with monsters should see to it that he himself does not become a monster. And if you gaze long enough into an abyss, the abyss will gaze back into you,"
Who resonated and how with nietzsche's quote "He who fights with monsters should see to it that he himself does not become a monster. And if you gaze?
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