Plato, Laws 723e

φασιν οἱ παίζοντες, ἀμεινόνων ἐξ ἀρχῆς δευτέρων ἐπαναπολήσωμεν, ὡς προοίμιον ἀλλʼ οὐ τὸν τυχόντα λόγον περαίνοντες, καθάπερ ἄρτι· λάβωμεν δʼ αὐτῶν ἀρχὴν ὁμολογοῦντες προοιμιάζεσθαι. καὶ τὰ μὲν περὶ θεῶν τιμῆς προγόνων τε θεραπείας, καὶ τὰ νυνδὴ λεχθέντα ἱκανά· τὰ δʼ ἑξῆς πειρώμεθα λέγειν, μέχριπερ ἄν σοι πᾶν τὸ προοίμιον ἱκανῶς εἰρῆσθαι δοκῇ. μετὰ δὲ τοῦτο ἤδη τοὺς νόμους αὐτοὺς διέξει λέγων.

by way of prelude. Let us, then, repeat from the start the second thoughts that are best (to quote the players’ proverb), treating them throughout as a prelude, and not, as before, as a chance discourse; and let us handle the opening part as being confessedly a prelude. As to the worship of the gods and the attention to be paid to ancestors, our previous statement is quite sufficient; it is what comes next to these that you must try to state, until the whole of the prelude has been, in our opinion, adequately set forth by you. After that you will proceed with your statement of the actual laws.