On the one hand, there are things that are in our power, whereas other things are not in our power. In our power are opinion, impulse, desire, aversion, and, in a word, whatever is our own doing. Things not in our power include our body, our possessions, our reputations, our status, and, in a word, whatever is not our own doing.  Now, things that are in our power are by nature free, unhindered, unimpeded; but things not in our power are weak, slavish, hindered, and belong to others.  Remember, therefore, that whenever you suppose those things that are by nature slavish to be free, or those things that belong others to be your own, you will be hindered, miserable and distressed, and you will find fault with both gods and men. If however you suppose to be yours only what is yours, and what belongs to another to belong to another (as indeed it does), no one will ever compel you, no one will hinder you; you will find fault with no one, reproach no one, nor act against your own will; you will have no enemies and no one will harm you, for no harm can touch you.
 Thus, when aiming at such great things remember that securing them requires more than a modest effort: some things you will have to give up altogether, and others you will have to put aside for the time being. If you want such great things but at the same time strive for status and wealth, you may well not even obtain these latter things because you are seeking the former; at any rate, you will certainly fail to secure those former great things which alone bring freedom and happiness.
 Straightaway then, train yourself to say to every unpleasant impression, ‘You are an impression, and by no means what you appear to be.’ Then examine it and test it by the rules that you have, firstly (in this way especially) by asking whether it concerns things that are in our power or things that are not in our power: and if it concerns something not in our power, have ready to hand the answer, ‘This is nothing to me.’