Plato, Meno 97d

τούτου οὕτως ἔχοντος, ὅτι δή ποτε πολὺ τιμιωτέρα ἡ ἐπιστήμη τῆς ὀρθῆς δόξης, καὶ διʼ ὅτι τὸ μὲν ἕτερον, τὸ δὲ ἕτερόν ἐστιν αὐτῶν. οἶσθα οὖν διʼ ὅτι θαυμάζεις, ἢ ἐγώ σοι εἴπω; πάνυ γʼ εἰπέ. ὅτι τοῖς Δαιδάλου ἀγάλμασιν οὐ προσέσχηκας τὸν νοῦν· ἴσως δὲ οὐδʼ ἔστιν παρʼ ὑμῖν. πρὸς τί δὲ δὴ τοῦτο λέγεις; ὅτι καὶ ταῦτα, ἐὰν μὲν μὴ δεδεμένα ᾖ, ἀποδιδράσκει καὶ δραπετεύει, ἐὰν δὲ δεδεμένα, παραμένει.

this being the case, that knowledge should ever be more prized than right opinion, and why they should be two distinct and separate things. Well, do you know why it is that you wonder, or shall I tell you? Please tell me. It is because you have not observed with attention the images of Daedalus. But perhaps there are none in your country. What is the point of your remark? That if they are not fastened up they play truant and run away; but, if fastened, they stay where they are.