Enchiridion 1

Some things are under our control, while others are not under our control. Under our control are conception, choice, desire, aversion, and, in a word, everything that is our own doing; not under our control are our body, our property, reputation, office, and, in a word, everything that is not our own doing. Furthermore, the things under our control are by nature free, unhindered, and unimpeded; while the things not under our control are weak, servile, subject to hindrance, and not our own. Remember, therefore, that if what is naturally slavish you think to be free, and what is not your own to be your own, you will be hampered, will grieve, will be in turmoil, and will blame both gods and men; while if you think only what is your own to be your own, and what is not your own to be, as it really is, not your own, then no one will ever be able to exert compulsion upon you, no one will hinder you, you will blame no one, will find fault with no one, will do absolutely nothing against your will, you will have no personal enemy, no one will harm you, for neither is there any harm that can touch you.

With such high aims, therefore, remember that you must bestir yourself with no slight effort to lay hold of them, but you will have to give up some things entirely, and defer others for the time being. But if you wish for these things also, and at the same time for both office and wealth, it may be that you will not get even these latter, because you aim also at the former, and certainly you will fail to get the former, which alone bring freedom and happiness.

Make it, therefore, your study at the very outset to say to every harsh external impression, "You are an external impression and not at all what you appear to be." After that examine it and test it by these rules which you have, the first and most important of which is this: Whether the impression has to do with the things which are under our control, or with those which are not under our control; and, if it has to do with some one of the things not under our control, have ready to hand the answer, "It is nothing to me."

Epictetus, Enchiridion 1, translated by W. A. Oldfather

Of things some are in our power, and others are not. In our power are opinion (ὑπόληψις), movement towards a thing (ὁρμή), desire, aversion (ἔκκλισις, turning from a thing); and in a word, whatever are our own acts: not in our power are the body, property, reputation, offices (magisterial power), and in a word, whatever are not our own acts. And the things in our power are by nature free, not subject to restraint nor hindrance: but the things not in our power are weak, slavish, subject to restraint, in the power of others. Remember then that if you think the things which are by nature slavish to be free, and the things which are in the power of others to be your own, you will be hindered, you will lament, you will be disturbed, you will blame both gods and men: but if you think that only which is your own to be your own, and if you think that what is another's, as it really is, belongs to another, no man will ever compel you, no man will hinder you, you will never blame any man, you will accuse no man, you will do nothing involuntarily (against your will), no man will harm you, you will have no enemy, for you will not suffer any harm.

If then you desire (aim at) such great things, remember that you must not (attempt to) lay hold of them with a small effort; but you must leave alone some things entirely, and postpone others for the present. But if you wish for these things also (such great things), and power (office) and wealth, perhaps you will not gain even these very things (power and wealth) because you aim also at those former things (such great things): certainly you will fail in those things through which alone happiness and freedom are secured. Straightway then practise saying to every harsh appearance, You are an appearance, and in no manner what you appear to be. Then examine it by the rules which you possess, and by this first and chiefly, whether it relates to the things which are in our power or to the things which are not in our power: and if it relates to any thing which is not in our power, be ready to say, that it does not concern you.

Epictetus, Enchiridion 1, translated by George Long

Of all existing things some are in our power, and others are not in our power. In our power are thought, impulse, will to get and will to avoid, and, in a word, everything which is our own doing. Things not in our power include the body, property, reputation, office, and, in a word, everything which is not our own doing. Things in our power are by nature free, unhindered, untrammelled; things not in our power are weak, servile, subject to hindrance, dependent on others. Remember then that if you imagine that what is naturally slavish is free, and what is naturally another's is your own, you will be hampered, you will mourn, you will be put to confusion, you will blame gods and men; but if you think that only your own belongs to you, and that what is another's is indeed another's, no one will ever put compulsion or hindrance on you, you will blame none, you will accuse none, you will do nothing against your will, no one will harm you, you will have no enemy, for no harm can touch you.

Aiming then at these high matters, you must remember that to attain them requires more than ordinary effort; you will have to give up some things entirely, and put off others for the moment. And if you would have these also—office and wealth—it may be that you will fail to get them, just because your desire is set on the former, and you will certainly fail to attain those things which alone bring freedom and happiness.

Make it your study then to confront every harsh impression with the words, 'You are but an impression, and not at all what you seem to be'. Then test it by those rules that you possess; and first by this—the chief test of all—'Is it concerned with what is in our power or with what is not in our power?' And if it is concerned with what is not in our power, be ready with the answer that it is nothing to you.

Epictetus, Enchiridion 1, translated by P. E. Matheson