Plato, Epinomis 989a

τὴν δὲ σοφίαν ταύτην, ἣν ζητοῦμεν πάλαι, ἴδωμεν ἄν ποτʼ ἄρα ἐπινοήσωμεν ἢ κατὰ παιδείαν ἢ κατὰ τέχνην, ἥντινα τοῦ γιγνώσκειν ἐνδεεῖς ὄντες τῶν δικαίων, ἀγνώμονες ἂν εἶμεν ὄντες τοιοῦτοι. δοκοῦμεν δή μοι, καὶ λεκτέον· ἄνω γὰρ καὶ κάτω ζητῶν ᾗ μοι καταφανὴς γέγονεν, πειράσομαι δήλην ὑμῖν αὐτὴν ἀποτελεῖν. τὸ δὴ μέγιστον ἀρετῆς οὐ καλῶς πραττόμενον ἡμῖν γέγονεν αἴτιον, ὡς ἄρτι σημαίνειν ἐκ τῶν

to be wise; and let us see if we may perhaps be able, either by education or by art, to perceive this wisdom which we have all this while been seeking; for if we fall behind the just in failing to know it, our condition will be that of ignorant persons. Such, then, seems our case to me, and I must say so: for I have sought this wisdom high and low, and so far as it has been revealed to me I will try to render it plain to you. Now the fact that the greatest part of virtue is not properly practiced is the cause of our condition, as is just now indicated—it seems clear to me—by what has been said.