Plato, Laws 817a

κωμῳδίαν πάντες λέγομεν, οὕτως τῷ νόμῳ καὶ λόγῳ κείσθω· τῶν δὲ σπουδαίων, ὥς φασι, τῶν περὶ τραγῳδίαν ἡμῖν ποιητῶν, ἐάν ποτέ τινες αὐτῶν ἡμᾶς ἐλθόντες ἐπανερωτήσωσιν οὑτωσί πως· ὦ ξένοι, πότερον φοιτῶμεν ὑμῖν εἰς τὴν πόλιν τε καὶ χώραν ἢ μή, καὶ τὴν ποίησιν φέρωμέν τε καὶ ἄγωμεν, ἢ πῶς ὑμῖν δέδοκται περὶ τὰ τοιαῦτα δρᾶν; — τί οὖν ἂν πρὸς ταῦτα ὀρθῶς ἀποκριναίμεθα τοῖς θείοις ἀνδράσιν;

as laid down both by law and by argument. Now as to what are called our serious poets, the tragedians,—suppose that some of them were to approach us and put some such question as this,—O Strangers, are we, or are we not, to pay visits to your city and country, and traffic in poetry? Or what have you decided to do about this? What would be the right answer to make to these inspired persons regarding the matter? In my judgment, this should be the answer,—Most excellent of Strangers,