Enchiridion 19

You can be invincible if you never enter a contest in which victory is not under your control. Beware lest, when you see some person preferred to you in honour, or possessing great power, or otherwise enjoying high repute, you are ever carried away by the external impression, and deem him happy. For if the true nature of the good is one of the things that are under our control, there is no place for either envy or jealousy; and you yourself will not wish to be a praetor, or a senator, or a consul, but a free man. Now there is but one way that leads to this, and that is to despise the things that are not under our control.

Epictetus, Enchiridion 19, translated by W. A. Oldfather

You can be invincible, if you enter into no contest in which it is not in your power to conquer. Take care then when you observe a man honoured before others or possessed of great power or highly esteemed for any reason, not to suppose him happy, and be not carried away by the appearance. For if the nature of the good is in our power, neither envy nor jealousy will have a place in us. But you yourself will not wish to be a general or senator (πρύτανις) or consul, but a free man: and there is only one way to this, to despise (care not for) the things which are not in our power.

Epictetus, Enchiridion 19, translated by George Long

You can be invincible, if you never enter on a contest where victory is not in your power. Beware then that when you see a man raised to honour or great power or high repute you do not let your impression carry you away. For if the reality of good lies in what is in our power, there is no room for envy or jealousy. And you will not wish to be praetor, or prefect or consul, but to be free; and there is but one way to freedom—to despise what is not in our power.

Epictetus, Enchiridion 19, translated by P. E. Matheson