Plato, Meno 75c

οὕτως ἀγαπῴην εἴ μοι ἀρετὴν εἴποις. ἀλλὰ τοῦτό γε εὔηθες, ὦ Σώκρατες. πῶς λέγεις; ὅτι σχῆμά πού ἐστιν κατὰ τὸν σὸν λόγον ὃ ἀεὶ χρόᾳ ἕπεται. εἶεν· εἰ δὲ δὴ τὴν χρόαν τις μὴ φαίη εἰδέναι, ἀλλὰ ὡσαύτως ἀποροῖ ὥσπερ περὶ τοῦ σχήματος, τί ἂν οἴει σοι ἀποκεκρίσθαι; τἀληθῆ ἔγωγε· καὶ εἰ μέν γε τῶν σοφῶν τις εἴη καὶ ἐριστικῶν τε καὶ ἀγωνιστικῶν ὁ ἐρόμενος, εἴποιμʼ ἂν

But it is such a silly one, Socrates. How do you mean? Well, figure, as I understand by your account, is what always follows color. Very good; but if some one said he did not know color, and was in the same difficulty about it as about figure, what answer do you suppose would have come from you? The truth, from me; and if my questioner were a professor of the eristic and contentious sort, I should say to him: