A nicely made video presenting one of the core ideas of stoic philosophy, which is that we have (some) control over what is within ourselves, and very little if any control over what is outside of ourselves.
Stoicism is a cognitive discipline, one that uses a group of relatively simple principles, thought tools, that can be used to judge and change the way we think about things.
Here’s an example of such a tool: “Some things are in our control, and others not.” (The first line in the archetypal Stoic manual, The Enchiridion by Epictetus.)
To use the tool, you remind yourself of it, or trigger it, by saying that sentence or some equivalent sentence that you have chosen as the tool’s reminder and activation. Then focus your attention on the issue you are concerned about, and go through a few steps of assessment to establish in your thinking about that issue whether it is in your control or not, or what parts of it are in your control and what parts of it are not.
What is in your control contains potential benefits for you if you concentrate upon it more of your time, attention, and disciplines. What is not in your control cannot give you benefits no matter how much of your time and attention, emotions or efforts you devote to it, other than as an accident or a coincidence.
The stoic mental technology is based largely on a model of conserving the energy of attention and brain.mind activity.
That is, it is a system designed to help you stop wasting your time and throwing away your life on silly bullshit, and keep more of your life for yourself.