Plato, Laws 719b

ἡμῖν, ὦ νομοθέτα· εἴπερ ὅτι χρὴ πράττειν ἡμᾶς καὶ λέγειν εἰδείης, ἆρα οὐ δῆλον ὅτι καὶ ἂν εἴποις; ἀναγκαῖον. σμικρῷ μὲν δὴ πρόσθεν ἆρα οὐκ ἠκούσαμέν σου λέγοντος ὡς τὸν νομοθέτην οὐ δεῖ τοῖς ποιηταῖς ἐπιτρέπειν ποιεῖν ὃ ἂν αὐτοῖς ᾖ φίλον; οὐ γὰρ ἂν εἰδεῖεν τί ποτʼ ἐναντίον τοῖς νόμοις ἂν λέγοντες βλάπτοιεν τὴν πόλιν. ἀληθῆ μέντοι λέγεις. ὑπὲρ δὴ τῶν ποιητῶν εἰ τάδε λέγοιμεν πρὸς αὐτόν, ἆρʼ ἂν τὰ λεχθέντα εἴη μέτρια; ποῖα;

to do and say, is it not obvious that you would state it? Inevitably. Now did not we hear you saying a little while ago that the lawgiver should not permit the poets to compose just as they please? For they would not be likely to know what saying of theirs might be contrary to the laws and injurious to the State. That is quite true. Would our address be reasonable, if we were to address him on behalf of the poets in these terms?— What terms?