I’ve long been familiar with Marcus Aurelius, though have never taken the deep dive into his work. However, this statement captures a deep truth for me.
This quote reminds me of a Steven Covey concept: Focusing on your Area of Influence. When we focus our efforts and energy on what we can impact, we become effective. Add that to “…you have power over your mind…”, and I see the power of focusing on our thoughts. Controlling our attitudes, I guess.