If they are wise, do not quarrel with them; if they are fools, ignore them. - Epictetus

Some things are in our control and others 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 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 do nothing against your will. No one will hurt you, you will have no enemies, and you not be harmed.

For of the things which are within the power of the will, as being good and present, you have a proper and regulated desire: but of the things which are not in the power of the will you do not desire any one, and so you do not allow any place to that which is irrational, and impatient, and above measure hasty.

For it is not death or pain that is to be feared, but the fear of pain or death.