Friedrich Nietzsche: He who fights with monsters

“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.

Friedrich Nietzsche: First idea, the known

“Danger, disquiet, anxiety attend the unknown—the first instinct is to eliminate those distressing states. First principle: any explanation is better than none. . . . The first idea which explains that the unknown is in fact the known does so much good that one ‘holds it for true.’” —Friedrich Nietzsche, Twilight of the Idols.