He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you. -- Friedrich Nietzsche, Beyond Good and Evil, Aphorism 146
Whoever fights monsters should see to it that in the process he does not become a monster. And when you look long into an abyss, the abyss also looks into you. - Friedrich Nietzsche