Plato, Laws 723a

τῶν ἰατρῶν οὓς εἴπομεν ἀνελευθέρους, τοῦτʼ εἶναι νόμος ἄκρατος, τὸ δὲ πρὸ τούτου ῥηθέν, πειστικὸν λεχθὲν ὑπὸ τοῦδε, ὄντως μὲν εἶναι πειστικόν, προοιμίου μὴν τοῦ περὶ λόγους δύναμιν ἔχειν. ἵνα γὰρ εὐμενῶς, καὶ διὰ τὴν εὐμένειαν εὐμαθέστερον, τὴν ἐπίταξιν, ὃ δή ἐστιν ὁ νόμος, δέξηται ᾧ τὸν νόμον ὁ νομοθέτης λέγει, τούτου χάριν εἰρῆσθαί μοι κατεφάνη πᾶς ὁ λόγος οὗτος, ὃν πείθων εἶπεν ὁ λέγων· διὸ δὴ κατά

comparing it to the prescriptions of the slave-doctors we mentioned—is unblended law; but the part which precedes this, and which is uttered as persuasive thereof, while it actually is persuasion, yet serves also the same purpose as the prelude to an oration. To ensure that the person to whom the lawgiver addresses the law should accept the prescription quietly—and, because quietly, in a docile spirit,—that, as I supposed, was the evident object with which the speaker uttered all his persuasive discourse. Hence, according to my argument,