Dio Chrysostom, Orations 65.7
ἀδικώτατά μοι δοκοῦσιν ἐγκαλεῖν οἱ πολλοὶ τῇ τύχῃ. νῦν μὲν γὰρ αὐτὴν αἰτιῶνται, φάσκοντες ἄπιστον εἶναι καὶ μηδὲν βέβαιον. εἰ δ’ ἀεὶ τοῖς αὐτοῖς παρέμενεν, οὐκ ἔστιν ὅπως οὐχὶ τῷ παντὶ μείζονος καὶ δικαιοτέρας ἐτύγχανεν ἂν κατηγορίας.
I think the accusations that most people bring against Fortune are most unjust. For, as things are, they find fault with her, saying that she is untrustworthy and not steadfast. But if she were always to remain with the same people, she would definitely meet with an altogether greater and more just accusation.