This is the essence of the not-understood-by-many serenity prayer. "grant me the serenity to accept the the things I cannot change, the courage to change the things I can--and the wisdom to know the difference." People think it means that we cannot affect outcomes as much as we think we can. True, but that is not the heart of the prayer. What you wrote is. I gather by your quoting Marcus Aurelius that you also lean towards stoic philosophy, which is also aligned with the Rumi quote and the serenity prayer. https://medium.com/channspirations/the-serenity-prayer-df758d99c956. Lastly for now, the work of the psychiatrist and holocaust survivor Viktor Frankl is also aligned with your takeaways from the Rumi quote. "What was really needed was a fundamental change in our attitude toward life. We had to learn ourselves and, furthermore, we had to teach the despairing men, that it did not really matter what we expected from life, but rather what life expected from us. We needed to stop asking about the meaning of life, and instead to think of ourselves as those who were being questioned by life — daily and hourly. Our answer must consist, not in talk and meditation, but in right action and in right conduct. Life ultimately means taking the responsibility to find the right answer to its problems and to fulfill the tasks which it constantly sets for each individual." Man's Search for Meaning." While I have written of this, I'll refer you to this fine piece by Katrina Bos instead https://baos.pub/how-viktor-frankls-man-s-search-for-meaning-still-affects-my-life-in-the-best-ways-7155c2e97cdb