Enchiridion 17

Remember that you are an actor in a play, the character of which is determined by the Playwright: if He wishes the play to be short, it is short; if long, it is long; if He wishes you to play the part of a beggar, remember to act even this rôle adroitly; and so if your rôle be that of a cripple, an official, or a layman. For this is your business, to play admirably the rôle assigned you; but the selection of that rôle is Another's.

Epictetus, Enchiridion 17, translated by W. A. Oldfather

Remember that thou art an actor in a play, of such a kind as the teacher (author) may choose; if short, of a short one; if long, of a long one: if he wishes you to act the part of a poor man, see that you act the part naturally; if the part of a lame man, of a magistrate, of a private person, (do the same). For this is your duty, to act well the part that is given to you; but to select the part, belongs to another.

Epictetus, Enchiridion 17, translated by George Long

Remember that you are an actor in a play, and the Playwright chooses the manner of it: if he wants it short, it is short; if long, it is long. If he wants you to act a poor man you must act the part with all your powers; and so if your part be a cripple or a magistrate or a plain man. For your business is to act the character that is given you and act it well; the choice of the cast is Another's.

Epictetus, Enchiridion 17, translated by P. E. Matheson