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).

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More from Friedrich Wilhelm Nietzsche

Through music the passions enjoy themselves.

Beyond Good and Evil, "Fourth Part: Maxims and Interludes," section 106 (1886).

How good bad music and bad reasons sound when we are marching into battle against an enemy.

Dawn, "Fifth Book," aphorism 557, "Into Battle Against an Enemy," (1881).

In revenge and in love woman is more barbaric than man is.

Beyond Good and Evil (1886)

In war personal revenge maintains its silence.

February 1883

In heaven, all the interesting people are missing.

Attributed