Epictetus, Works, book 4, Πρὸσ τοὺσ εὐκόλωσ ἐκφέροντασ τὰ αὑτῶν. 6:

τοιοῦτόν τι καὶ ἐν τῷ καθόλου πάσχομεν. οὐ γὰρ ὡσ ἐμοὶ ἐκεῖνοσ ἀσφαλῶσ πεπίστευκεν τὰ ἑαυτοῦ, οὕτωσ κἀγὼ τῷ ἐπιτυχόντι·