Plato, Laws 720a

ἄλλον τρέπηται νόμον, παραμυθίας δὲ καὶ πειθοῦς τοῖς νομοθετουμένοις μηδὲ ἓν προσδιδῷ; καθάπερ ἰατρὸς δέ τις, ὁ μὲν οὕτως, ὁ δʼ ἐκείνως ἡμᾶς εἴωθεν ἑκάστοτε θεραπεύειν— ἀναμιμνῃσκώμεθα δὲ τὸν τρόπον ἑκάτερον, ἵνα τοῦ νομοθέτου δεώμεθα, καθάπερ ἰατροῦ δέοιντο ἂν παῖδες τὸν πρᾳότατον αὐτὸν θεραπεύειν τρόπον ἑαυτούς. οἷον δὴ τί λέγομεν; εἰσὶν πού τινες ἰατροί, φαμέν, καί τινες ὑπηρέται τῶν ἰατρῶν, ἰατροὺς δὲ καλοῦμεν δήπου καὶ τούτους.

but declare at once what must be done and what not, and state the penalty which threatens disobedience, and so turn off to another law, without adding to his statutes a single word of encouragement and persuasion? Just as is the way with doctors, one treats us in this fashion, and another in that: they have two different methods, which we may recall, in order that, like children who beg the doctor to treat them by the mildest method, so we may make a like request of the lawgiver. Shall I give an illustration of what I mean? There are men that are doctors, we say, and others that are doctors’ assistants; but we call the latter also, to be sure, by the name of doctors.