Plato, Letters 354a

ὀρθότατα φιλέλλην ἂν λεχθείη· ὃ δέ μοι φαίνεταί πῃ τὰ νῦν, ἐγὼ πειράσομαι πάσῃ παρρησίᾳ καὶ κοινῷ τινι δικαίῳ λόγῳ χρώμενος δηλοῦν. λέγω γὰρ δὴ διαιτητοῦ τινα τρόπον διαλεγόμενος ὡς δυοῖν, τυραννεύσαντί τε καὶ τυραννευθέντι, ὡς ἑνὶ ἑκατέρῳ παλαιὰν ἐμὴν συμβουλήν· καὶ νῦν δὲ ὅ γʼ ἐμὸς λόγος ἂν εἴη σύμβουλος τυράννῳ παντὶ φεύγειν μὲν τοὔνομά τε καὶ τοὖργον τοῦτο, εἰς βασιλείαν δέ, εἰ δυνατὸν

and puts it openly before us, he shall have the best right to the title Friend of Greece. The remedy, however, which commends itself to me I shall now endeavor to explain, using the utmost freedom of speech and a tone of impartial justice. For indeed I am speaking somewhat like an arbitrator, and addressing to the two parties, the former despot and his subjects, as though each were a single person, the counsel I gave of old. And now also my word of advice to every despot would be that he should shun the despot’s title and his task, and change his despotism for kingship.