Plato, Letters 336d

πάτρια, διώκοντα δὲ τόν τε τῶν Δίωνος σφαγέων καὶ τὸν Σικελικὸν βίον, μήτε παρακαλεῖν μήτε οἴεσθαι πιστὸν ἄν τι καὶ ὑγιὲς πρᾶξαί ποτε, τοὺς δὲ ἄλλους παρακαλεῖν ἐπὶ πάσης Σικελίας κατοικισμόν τε καὶ ἰσονομίαν ἔκ τε αὐτῆς Σικελίας καὶ ἐκ Πελοποννήσου συμπάσης, φοβεῖσθαι δὲ μηδὲ Ἀθήνας· εἰσὶ γὰρ καὶ ἐκεῖ πάντων ἀνθρώπων διαφέροντες πρὸς ἀρετήν, ξενοφόνων τε ἀνδρῶν μισοῦντες τόλμας. εἰ δʼ οὖν ταῦτα μὲν ὕστερα γένοιτʼ ἄν, κατεπείγουσιν δὲ ὑμᾶς αἱ τῶν

the Sicilian way of life and that of Dion’s murderers, him you should neither call to your aid nor imagine that he could ever perform a loyal or sound action; but all others you should call to aid you in repeopling all Sicily and giving it equal laws, calling them both from Sicily itself and from the whole of the Peloponnese, not fearing even Athens itself; for there too there are those who surpass all men in virtue, and who detest the enormities of men who slay their hosts. But—though these results may come about later,—if for the present you are beset by the constant quarrels of every kind