“He who fights with monsters should look to it that he himself does not become a monster. And if you gaze long into an abyss, the abyss also gazes into you.”Friedrich Nietzsche · Dincolo de bine și de rău · 1886 · Dincolo de bine și de rău, § 146
Fighting evil can turn you into the monster you fight
Nietzsche warns that fighting against something evil can turn you into what you despise. The mechanism is subtle: to defeat a monster, you might start using violence, lies, or hatred—exactly its weapons. And the 'abyss' symbolizes obsession: if you focus too much on a danger or enemy, you end up internalizing its nature. For example, an activist fighting corruption may become corrupt themselves, justifying any means by the end.
When you focus solely on fighting an evil, you risk shaping your entire identity around that opposition. For example, a parent who completely bans sweets for their child may become as rigid and controlling as an extreme diet regimen. Thus, your struggle becomes a mirror of the adversary, not a path to freedom. The next step is to understand how you can stay true to your values without losing yourself in the conflict.
Why it matters It's a useful warning in personal or political conflicts: it forces you to maintain your integrity and not become what you fight. In an age of polarization, it guards against radicalization.