Plato, Meno 86c

δυνατὸν εἶναι εὑρεῖν μηδὲ δεῖν ζητεῖν, περὶ τούτου πάνυ ἂν διαμαχοίμην, εἰ οἷός τε εἴην, καὶ λόγῳ καὶ ἔργῳ. καὶ τοῦτο μέν γε δοκεῖς μοι εὖ λέγειν, ὦ Σώκρατες. βούλει οὖν, ἐπειδὴ ὁμονοοῦμεν ὅτι ζητητέον περὶ οὗ μή τις οἶδεν, ἐπιχειρήσωμεν κοινῇ ζητεῖν τί ποτʼ ἐστὶν ἀρετή; πάνυ μὲν οὖν. οὐ μέντοι, ὦ Σώκρατες, ἀλλʼ ἔγωγε ἐκεῖνο ἂν ἥδιστα, ὅπερ ἠρόμην τὸ πρῶτον, καὶ σκεψαίμην καὶ ἀκούσαιμι, πότερον ὡς διδακτῷ ὄντι αὐτῷ δεῖ ἐπιχειρεῖν,

nor any duty of inquiring after it—this is a point for which I am determined to do battle, so far as I am able, both in word and deed. There also I consider that you speak aright, Socrates. Then since we are of one mind as to the duty of inquiring into what one does not know, do you agree to our attempting a joint inquiry into the nature of virtue? By all means. But still, Socrates, for my part I would like best of all to examine that question I asked at first, and hear your view as to whether in pursuing it we are to regard it as a thing to be taught, or as a gift of nature to mankind,