He who fights against monsters should see to it that he does not become a monster in the process. And when you stare persistently into an abyss, the abyss also stares into you. Beyond Good and Evil, "Fourth Part: Maxims and Interludes," section 146 (1886).

More from Beyond Good and Evil, "Fourth Part

• Through music the passions enjoy themselves. Beyond Good and Evil, "Fourth Part: Maxims and Interludes," section 106 (1886).