Plato, Republic, book 6 219:

οὐκοῦν εὐθὺσ ἐν παισὶν ὁ τοιοῦτοσ πρῶτοσ ἔσται ἐν ἅπασιν, ἄλλωσ τε καὶ ἐὰν τὸ σῶμα φυῇ προσφερὴσ τῇ ψυχῇ;