Some things are in our control and others are not. Things in our control are opinion, pursuit, desire, aversion, and, in a word, whatever are our own actions. Things not in our control are body, property, reputation, command, and, in one word, whatever are not our own actions.

The things in our control are by nature free, unrestrained, unhindered,; but those not in our control are weak, slavish, restrained, belonging to others. Remember, then, that if you suppose that things which are slavish by nature are also free, and that what belongs to others is your own, then you will be hindered. You will lament, you will be disturbed, and you will find fault both with gods and men. But if you suppose that only to be your own which is your own, and what belongs to others such as it really is, then no one will ever compel you or restrain you. Further, you will find fault with no one or accuse no one. You will de nothing against your will. No one will hurt you, you will have no enemies, and you not be harmed.

Aiming therefore at such great things, remember that you must not allow yourself to be carried even with a slight tendency, towards the attainment of lesser things. Instead, you must entirely quit some things for the present postpone the rest. But if you would both have these great things, along with power and riches, then you will not gain even the latter, because you aim at the former too: but you will absolutely fail of the former, by which alone happiness and freedom are achieved.

taken from The Enchiridion By Epictetus