Plato, Letters 331b

ἢ περὶ σώματος ἢ ψυχῆς ἐπιμελείας, ἂν μέν μοι τὸ καθʼ ἡμέραν ἔν τινι τρόπῳ δοκῇ ζῆν ἢ συμβουλεύσαντος ἂν ἐθέλειν πείθεσθαι περὶ ὧν ἀνακοινοῦται, προθύμως συμβουλεύω καὶ οὐκ ἀφοσιωσάμενος μόνον ἐπαυσάμην. ἐὰν δὲ μὴ συμβουλεύηταί μοι τὸ παράπαν ἢ συμβουλεύοντι δῆλος ᾖ μηδαμῇ πεισόμενος, αὐτόκλητος ἐπὶ τὸν τοιοῦτον οὐκ ἔρχομαι συμβουλεύσων, βιασόμενος δὲ οὐδʼ ἂν ὑὸς ᾖ μου. δούλῳ δὲ συμβουλεύσαιμʼ ἂν καὶ μὴ ἐθέλοντά γε προσβιαζοίμην·

or the care of his body or his soul,—if I believe that he is carrying on his daily life in a proper way, or that he will be willing to obey my advice in regard to the matters disclosed, then I give counsel readily and do not confine myself to some merely cursory reply. But if he does not ask my advice at all or plainly shows that he will in no wise obey his adviser, I do not of my own instance come forward to advise such an one, nor yet to compel him, not even were he my own son. To a slave, however, I would give advice, and if he refused it I would use compulsion. But to a father or mother