Plato, Letters 316b

ἀπολογίας πρός τε τὴν προτέραν γενομένην διαβολὴν καὶ τὴν νῦν μετʼ ἐκείνην μείζω φυομένην καὶ σφοδροτέραν. πρὸς δύο δή μοι διττὰς ἀναγκαῖον ποιήσασθαι τὰς ἀπολογίας, πρῶτον μὲν ὡς εἰκότως σοι ἔφυγον κοινωνεῖν περὶ τὰ τῆς πόλεως πράγματα, τὸ δὲ δεύτερον ὡς οὐκ ἐμὴν ταύτην εἴρηκας συμβουλὴν οὐδὲ διακώλυσιν, μέλλοντί σοι κατοικίζειν Ἑλληνίδας

a defence not only against the previous false accusations, but also against the graver and more violent accusation which is now being concocted to follow it. Against the two accusations I must necessarily make a twofold defence—stating, firstly, that I reasonably avoided sharing in your political transactions; and, secondly, that neither the advice was mine, nor yet the hindrance you alleged,—when you said that I had stopped you when you proposed to plant colonists in the Greek cities. So, listen first