Plato, Meno 93b

πρόσθεν, ἀλλʼ εἰ διδακτόν ἐστιν ἀρετὴ πάλαι σκοποῦΜΕΝ. τοῦτο δὲ σκοποῦντες τόδε σκοποῦμεν, ἆρα οἱ ἀγαθοὶ ἄνδρες καὶ τῶν νῦν καὶ τῶν προτέρων ταύτην τὴν ἀρετὴν ἣν αὐτοὶ ἀγαθοὶ ἦσαν ἠπίσταντο καὶ ἄλλῳ παραδοῦναι, ἢ οὐ παραδοτὸν τοῦτο ἀνθρώπῳ οὐδὲ παραληπτὸν ἄλλῳ παρʼ ἄλλου· τοῦτʼ ἔστιν ὃ πάλαι ζητοῦμεν ἐγώ τε καὶ Μένων. ὧδε οὖν σκόπει ἐκ τοῦ σαυτοῦ λόγου· Θεμιστοκλέα οὐκ ἀγαθὸν ἂν

good men here amongst us or not, but whether virtue is teachable; this has been our problem all the time. And our inquiry into this problem resolves itself into the question: Did the good men of our own and of former times know how to transmit to another man the virtue in respect of which they were good, or is it something not to be transmitted or taken over from one human being to another? That is the question I and Meno have been discussing all this time. Well, just consider it in your own way of speaking: