Plato, Letters 317a

πλεῦσαι μὲν οἴκαδε ἐμέ, ἐπειδὴ πόλεμος ὑμᾶς κατεῖχεν, εἰρήνης δʼ αὖ γενομένης ἐλθεῖν ἐμέ τε καὶ Δίωνα εἰς Συρακούσας, σὲ δὲ καλεῖν ἡμᾶς. καὶ ταῦτα μὲν οὕτως ἐγένετο τῆς ἐμῆς εἰς Συρακούσας ἀποδημίας πέρι τῆς πρώτης καὶ τῆς πάλιν οἴκαδε σωτηρίας· τὸ δὲ δεύτερον εἰρήνης γενομένης ἐκάλεις με οὐ κατὰ τὰς ὁμολογίας, ἀλλὰ μόνον ἥκειν ἐπέστειλας, Δίωνα δʼ εἰς αὖθις ἔφησθα μεταπέμψεσθαι. διὰ ταῦτα οὐκ ἦλθον, ἀλλὰ καὶ Δίωνι τότʼ ἀπηχθόμην· ᾤετο γὰρ

since you were engaged in war, and that, when peace was restored, Dion and I should go to Syracuse and that you should invite us. And that was how things took place as regards my first sojourn at Syracuse and my safe return home again. But on the second occasion, when peace was restored, you did not keep to our agreement in the invitation you gave me but wrote that I should come alone, and stated that you would send for Dion later on. On this account I did not go; and, moreover, I was vexed also with Dion;