Plato, Laws 720d

τῆς ἐπιμελείας· ὁ δὲ ἐλεύθερος ὡς ἐπὶ τὸ πλεῖστον τὰ τῶν ἐλευθέρων νοσήματα θεραπεύει τε καὶ ἐπισκοπεῖ, καὶ ταῦτα ἐξετάζων ἀπʼ ἀρχῆς καὶ κατὰ φύσιν, τῷ κάμνοντι κοινούμενος αὐτῷ τε καὶ τοῖς φίλοις, ἅμα μὲν αὐτὸς μανθάνει τι παρὰ τῶν νοσούντων, ἅμα δὲ καὶ καθʼ ὅσον οἷός τέ ἐστιν, διδάσκει τὸν ἀσθενοῦντα αὐτόν, καὶ οὐ πρότερον ἐπέταξεν πρὶν ἄν πῃ συμπείσῃ, τότε δὲ μετὰ πειθοῦς ἡμερούμενον ἀεὶ

But the free-born doctor is mainly engaged in visiting and treating the ailments of free men, and he does so by investigating them from the commencement and according to the course of nature; he talks with the patient himself and with his friends, and thus both learns himself from the sufferers and imparts instruction to them, so far as possible; and he gives no prescription until he has gained the patient’s consent, and only then, while securing the patient’s continued docility by means of persuasion,