Epictetus, Works, book 4, Περὶ ἐλευθερίασ. 105:

οὐ θέλεισ οὖν, ἑώσ δέδοταί σοι, θεασάμενοσ τὴν πομπὴν καὶ τὴν πανήγυριν εἶτα, ὅταν σ’ ἐξάγῃ, πορεύεσθαι προσκυνήσασ καὶ εὐχαριστήσασ ὑπὲρ ὧν ἤκουσασ καὶ εἶδεσ;