Plato, Laws 667d

ἆρʼ οὐκ, ἂν τοῦτο ἐξεργάζωνται, τὸ μὲν ἡδονὴν ἐν αὐτοῖς γίγνεσθαι παρεπόμενον, ἐὰν γίγνηται, χάριν αὐτὸ δικαιότατον ἂν εἴη προσαγορεύειν; ναί. τὴν δέ γε ὀρθότητά που τῶν τοιούτων ἡ ἰσότης ἄν, ὡς ἐπὶ τὸ πᾶν εἰπεῖν, ἐξεργάζοιτο τοῦ τε τοσούτου καὶ τοῦ τοιούτου πρότερον, ἀλλʼ οὐχ ἡδονή. καλῶς. οὐκοῦν ἡδονῇ κρίνοιτʼ ἂν μόνον ἐκεῖνο ὀρθῶς, ὃ μήτε τινὰ ὠφελίαν μήτε ἀλήθειαν μήτε ὁμοιότητα ἀπεργαζόμενον

Then how about the imitative arts which produce likenesses? If they succeed in their productions, should not any concomitant pleasure which results therefrom be most properly called charm? Yes. But, speaking generally, the correctness of these things would be the result not, primarily, of pleasure, but of equality in respect of both quality and quantity. Excellent. Then we shall rightly judge by the criterion of pleasure