There must always remain something that is antagonistic to good. — Plato
There must always remain something that is antagonistic to good.
Author: Plato
Insight: Without friction, effort becomes meaningless. That promotion feels hollow if nobody competed for it; your workout bores you without resistance. Plato's point: struggle isn't a bug in life—it's what makes anything worth having.
Source: Theaetetus, 176a