Plato, Laws 863b

δῆλον γὰρ ὅτι τοσόνδε γε περὶ ψυχῆς καὶ λέγετε πρὸς ἀλλήλους καὶ ἀκούετε, ὡς ἓν μὲν ἐν αὐτῇ τῆς φύσεως εἴτε τι πάθος εἴτε τι μέρος ὢν ὁ θυμός, δύσερι καὶ δύσμαχον κτῆμα ἐμπεφυκός, ἀλογίστῳ βίᾳ πολλὰ ἀνατρέπει. πῶς δʼ οὔ; καὶ μὴν ἡδονήν γε οὐ ταὐτὸν τῷ θυμῷ προσαγορεύομεν, ἐξ ἐναντίας δὲ αὐτῷ φαμεν ῥώμης δυναστεύουσαν, πειθοῖ μετὰ ἀπάτης βιαίου πράττειν πᾶν ὅτιπερ ἂν αὐτῆς ἡ βούλησις ἐθελήσῃ. καὶ μάλα.

No doubt in conversing with one another you say and hear said at least thus much about the soul, that one element in its nature (be it affection or part) is passion, which is an inbred quality of a contentious and pugnacious kind, and one that overturns many things by its irrational force. Of course. Moreover, we distinguish pleasure from passion, and we assert that its mastering power is of an opposite kind, since it effects all that its intention desires by a mixture of persuasion and deceit. Exactly.