Plato, Letters 318b

αὐτοῦ. πολλὰ ἔχων εἰπεῖν ὧν ὑποσχόμενος οὐδὲν ἐποίησας, διὰ τὸ πλῆθος αὐτῶν συντέμνω. τὰ γὰρ δὴ χρήματα πάντα ἀποδόμενος, οὐ πείσας Δίωνα, φάσκων οὐ πωλήσειν ἄνευ τοῦ πείθειν, τὸν κολοφῶνα, ὦ θαυμάσιε, ταῖς ὑποσχέσεσιν ἁπάσαις νεανικώτατον ἐπέθηκας· μηχανὴν γὰρ οὔτε καλὴν οὔτε κομψὴν οὔτε δικαίαν οὔτε συμφέρουσαν ηὗρες, ἐμὲ ἐκφοβεῖν ὡς ἀγνοοῦντα τὰ τότε γιγνόμενα, ἵνα μηδὲ ἐγὼ ζητοίην

And I could mention many other promises none of which you fulfilled; but the number of them is so great that I cut it short. For when you had sold all the goods, without Dion’s consent—though you had declared that without his consent you would not dispose of them—you put the coping-stone on all your promises, my admirable friend, in a most outrageous way: you invented a plan that was neither noble nor ingenious nor just nor profitable —namely, to scare me off from so much as