Plato, Letters 317c

διὰ σὲ ἐξ Ἰταλίας καὶ Σικελίας, καὶ παρʼ ὅσους τῶν ἐμῶν οἰκείων καὶ τῶν γνωρίμων, καὶ πᾶσαι διακελευόμεναί μοι ἰέναι καὶ δεόμεναι σοὶ πάντως ἐμὲ πείθεσθαι. ἐδόκει δὴ πᾶσιν, ἀρξαμένοις ἀπὸ Δίωνος, δεῖν ἐμὲ πλεῦσαι καὶ μὴ μαλθακίζεσθαι. καίτοι τήν θʼ ἡλικίαν αὐτοῖς προυτεινόμην καὶ περὶ σοῦ διισχυριζόμην ὡς οὐχ οἷός τʼ ἔσοιο ἀνταρκέσαι τοῖς διαβάλλουσιν ἡμᾶς καὶ βουλομένοις εἰς ἔχθραν ἐλθεῖν—ἑώρων γὰρ καὶ τότε καὶ νῦν ὁρῶ τὰς μεγάλας οὐσίας καὶ ὑπερόγκους τῶν τε ἰδιωτῶν καὶ τῶν μονάρχων σχεδόν,

from others on your account, or to how many of my friends and acquaintances they were addressed, all enjoining me to go and beseeching me to trust you entirely. It was the firm opinion of everyone, beginning with Dion, that it was my duty to make the voyage and not be faint-hearted. But I always made my age an excuse; and as for you, I kept assuring them that you would not be able to withstand those who slander us and desire that we should quarrel; for I saw then, as I see now, that, as a rule, when great and exorbitant wealth is in the hands either of private citizens or of monarchs,