Plato, Letters 340e

ἡλίκος καὶ δίαιτα ἡ καθʼ ἡμέραν ὡς πρέπουσα ἡ κοσμία τῷ πράγματι, χαλεπὸν ἡγησάμενοι καὶ ἀδύνατον αὑτοῖς, οὔτε δὴ

and how the orderly mode of daily life is that which befits the subject, they deem it difficult or impossible for themselves, and thus they become in fact incapable of pursuing it;