Plato, Laws 801c

ἱκανόν ἐστι γιγνώσκειν σφόδρα τά τε ἀγαθὰ καὶ μή; ποιήσας οὖν δήπου τὶς ποιητὴς ῥήμασιν ἢ καὶ κατὰ μέλος τοῦτο ἡμαρτημένον, εὐχὰς οὐκ ὀρθάς, ἡμῖν τοὺς πολίτας περὶ τῶν μεγίστων εὔχεσθαι τἀναντία ποιήσει· καίτοι τούτου, καθάπερ ἐλέγομεν, οὐ πολλὰ ἁμαρτήματα ἀνευρήσομεν μείζω. θῶμεν δὴ καὶ τοῦτον τῶν περὶ μοῦσαν νόμων καὶ τύπων ἕνα; τίνα; σαφέστερον εἰπὲ ἡμῖν. τὸν ποιητὴν παρὰ τὰ τῆς πόλεως νόμιμα καὶ δίκαια

very well what is good and what not? For surely when a poet, suffering from this error, composes prayers either in speech or in song, he will be making our citizens contradict ourselves in their prayers for things of the greatest moment; yet this, as we have said, is an error than which few are greater. So shall we also lay down this as one of our laws and typical cases regarding music? What law? Explain it to us more clearly. The law that the poet shall compose nothing which goes beyond the limits of what the State holds to be legal and right, fair and good; nor shall he show