Plato, Laws 746c

ἀδύνατόν τι συμβαίνει τούτων γίγνεσθαι, τοῦτο μὲν αὐτὸ ἐκκλίνειν καὶ μὴ πράττειν, ὅτι δὲ τούτου τῶν λοιπῶν ἐγγύτατά ἐστιν καὶ συγγενέστατον ἔφυ τῶν προσηκόντων πράττειν, τοῦτʼ αὐτὸ διαμηχανᾶσθαι ὅπως ἂν γίγνηται, τὸν νομοθέτην δʼ ἐᾶσαι τέλος ἐπιθεῖναι τῇ βουλήσει, γενομένου δὲ τούτου, τότʼ ἤδη κοινῇ μετʼ ἐκείνου σκοπεῖν ὅτι τε συμφέρει τῶν εἰρημένων καὶ τί πρόσαντες εἴρηται τῆς νομοθεσίας· τὸ γὰρ ὁμολογούμενον αὐτὸ αὑτῷ δεῖ που πανταχῇ

that particular detail he should omit and leave unexecuted, but contrive to execute instead whatever of the remaining details comes nearest to this and is by nature most closely akin to the right procedure; and he should allow the lawgiver to express his ideal completely; and when this is done, then and then only should they both consult together as to how far their proposals are expedient and how much of the legislation is impracticable. For the constructor of even the most trivial object, if he is to be of any merit, must make it in all points