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Epictetus · Stoic philosopher

People are disturbed not by things, but by their opinions about things.
Ταράσσει τοὺς ἀνθρώπους οὐ τὰ πράγματα, ἀλλὰ τὰ περὶ τῶν πραγμάτων δόγματα.

Enchiridion (recorded by Arrian), section 5