Plato, Letters 330c

τε καὶ διατριβῆς διὰ πάντα ταῦτα συνέβη γενόμενος. μετὰ δὲ τοῦτο ἀπεδήμησά τε καὶ πάλιν ἀφικόμην πάσῃ σπουδῇ μεταπεμπομένου Διονυσίου· ὧν δὲ ἕνεκα καὶ ὅσα ἔπραξα, ὡς εἰκότα τε καὶ δίκαια, ὑμῖν πρῶτον μὲν συμβουλεύσας ἃ χρὴ ποιεῖν ἐκ τῶν νῦν γεγονότων, ὕστερον τὰ περὶ ταῦτα διέξειμι, τῶν ἐπανερωτώντων ἕνεκα τί δὴ βουλόμενος ἦλθον τὸ δεύτερον, ἵνα μὴ τὰ πάρεργα ὡς ἔργα μοι συμβαίνῃ λεγόμενα. λέγω δὴ τάδε ἐγώ—τὸν συμβουλεύοντα ἀνδρὶ κάμνοντι καὶ δίαιταν διαιτωμένῳ

and I returned again on receiving a most urgent summons from Dionysius. That my motives for doing so and all my actions were reasonable and just, all this I will try to explain later on, for the benefit of those who ask what object I had in going the second time. But first I must counsel you as to the course you ought to adopt in view of the present circumstances, so as not to give the first place to matters of secondary importance. What I have to say, then, is this: Ought not the doctor that is giving counsel to a sick man who is indulging in