Plato, Laws 831c

οὐδαμῶς, ὦ μακάριε Κλεινία· δύο δὲ χρὴ φάναι τούτων αἰτίας εἶναι καὶ μάλα ἱκανάς. ποίας; τὴν μὲν ὑπʼ ἔρωτος πλούτου πάντα χρόνον ἄσχολον ποιοῦντος τῶν ἄλλων ἐπιμελεῖσθαι πλὴν τῶν ἰδίων κτημάτων, ἐξ ὧν κρεμαμένη πᾶσα ψυχὴ πολίτου παντὸς οὐκ ἄν ποτε δύναιτο τῶν ἄλλων ἐπιμέλειαν ἴσχειν πλὴν τοῦ καθʼ ἡμέραν κέρδους· καὶ ὅτι μὲν πρὸς τοῦτο φέρει μάθημα ἢ καὶ ἐπιτήδευμα, ἰδίᾳ πᾶς μανθάνειν τε καὶ ἀσκεῖν ἑτοιμότατός ἐστιν,

is that there are two causes, and both most weighty ones. What are they? The first springs from a lust for wealth which allows a man no leisure time for attention to anything else save his own private property; and when the soul of every citizen hangs upon this, it is incapable of attending to matters other than daily gain. Whatsoever science or pursuit leads to this, every man individually is most ready to learn and to practice; but all else he laughs to scorn.