Snippets from the Handbook 6

Therefore let your will to avoid have no concern with what is not in man's power; direct it only to things in man's power that are contrary to nature. 

But for the moment you must utterly remove the will to get; for if you will to get something not in man's power you are bound to be unfortunate; while none of the things in man's power that you could honorably will to get is yet within your reach. 

Impulse to act and not to act, these are your concern; yet exercise them gently and without strain, and provisionally. 

—Epictetus, The Handbook 2