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.
Some things are in our control, while others are not. We control our opinion, choice, desire, aversion, and, in a word, everything of our own doing. We don't control our body, property, reputation, position, and, in a word, everything not of our own doing. Even more, the things in our control are by nature free, unhindered, and unobstructed, while those not in our control are weak, slavish, can be hindered, and are not our own.
The soul is like a bowl of water, and our impressions are like the ray of light falling upon the water. When the water is troubled, it appears that the light is moved too, but it isn't. So, when a person loses their composure it isn't their skills and virtues that are troubled, but the spirit in which they exist, and when that spirit calms down so do those things.