Plato, Laws 858a

ἐν σκέψει γενομένους περὶ πάσης πολιτείας πειρᾶσθαι κατιδεῖν τό τε ἄριστον καὶ τὸ ἀναγκαιότατον, τίνα τρόπον ἂν γιγνόμενον γίγνοιτο. καὶ δὴ καὶ τὸ νῦν ἔξεστιν ἡμῖν, ὡς ἔοικεν, εἰ μὲν βουλόμεθα, τὸ βέλτιστον σκοπεῖν, εἰ δὲ βουλόμεθα, τὸ ἀναγκαιότατον περὶ νόμων· αἱρώμεθα οὖν πότερον δοκεῖ. γελοίαν, ὦ ξένε, προτιθέμεθα τὴν αἵρεσιν, καὶ ἀτεχνῶς ὥσπερ κατεχομένοις νομοθέταις ὅμοιοι γιγνοίμεθʼ

but only to become students ourselves, and endeavor to discern in regard to every polity how the best form might come about, and how that which is the least elaborate possible. Moreover, we are now allowed, as it seems, to study, if we choose, the best form of legislation, or, if we choose, the least elaborate. So let us make our choice between these two. The choice we propose, Stranger, is an absurd one: we should be acting like legislators