Men are disturbed, not by things, but by the principles and notions - Epictetus

The chief task in life is simply this: to identify and separate matters so that I can say clearly to myself which are externals not under my control, and which have to do with the choices I actually control. Where then do I look for good and evil? Not to uncontrollable externals, but within myself to the choices that are my own...

But I’ll get money, and then share it.” If you can acquire riches without losing your honor and self-respect, then do it. But if you lose what is dearest to you, no amount of money can make up for it.

With every accident, ask yourself what abilities you have for making a proper use of it. If you see an attractive person, you will find that self-restraint is the ability you have against your desire. If you are in pain, you will find fortitude. If you hear unpleasant language, you will find patience. And thus habituated, the appearances of things will not hurry you away along with them.