Plato, Laws 659b

ἐπεκαλέσατο μέλλων κρίνειν, ἐκ τούτου ψευδόμενον ἀποφαίνεσθαι ῥᾳθύμως τὴν κρίσιν· οὐ γὰρ μαθητὴς ἀλλὰ διδάσκαλος, ὥς γε τὸ δίκαιον, θεατῶν μᾶλλον ὁ κριτὴς καθίζει, καὶ ἐναντιωσόμενος τοῖς τὴν ἡδονὴν μὴ προσηκόντως μηδὲ ὀρθῶς ἀποδιδοῦσι θεαταῖς. ἐξῆν γὰρ δὴ τῷ παλαιῷ τε καὶ Ἑλληνικῷ νόμῳ, οὐ καθάπερ ὁ Σικελικός τε καὶ Ἰταλικὸς νόμος νῦν, τῷ πλήθει τῶν θεατῶν ἐπιτρέπων καὶ τὸν νικῶντα διακρίνων χειροτονίαις, διέφθαρκε μὲν τοὺς ποιητὰς αὐτούς

For, rightly speaking, the judge sits not as a pupil, but rather as a teacher of the spectators, being ready to oppose those who offer them pleasure in a way that is unseemly or wrong; and that is what the present law of Sicily and Italy actually does: by entrusting the decision to the spectators, who award the prize by show of hands, not only has it corrupted the poets