Plato, Republic, book 9 235:

τί δέ; τὸ θυμοειδὲσ οὐ πρὸσ τὸ κρατεῖν μέντοι φαμὲν καὶ νικᾶν καὶ εὐδοκιμεῖν ἀεὶ ὅλον ὡρμῆσθαι;