Reminds me of stoicism. If it's outside your control, don't bother too much. Face your challenges and do the best you can, being a better you.
I had exactly the same epiphany while reading Meditations. I thought, "wow, this sounds an awful lot like the Buddhism I've read/heard about".
Again, after reading Ralph Waldo Emerson I saw the same wisdom with a different face. I realized that all these people throughout time came independently to precisely the same conclusions about how to live life as part of the great "wholeness" (for lack of a better word) to which we all belong.
My experience with Buddhism is mostly limited to interactions with an old Buddhist friend, but in terms of literature I found Hermann Hesse's Siddhartha and J. D. Salinger's Teddy to be very palatable from a western perspective.
For stoic philosophy you can really do no better than Marcus Aurelius's meditations, specifically the more modern Gregory Hays translation. Epictectus's discourses are pretty good too, but are less pithy and have a lower signal to noise ratio when it comes to true wisdom IMO.
Emerson's Self Reliance, History, and finally The Oversoul will reveal the same wisdom from all the other works I mentioned.
Aldous Huxley wrote a book about it: https://en.wikipedia.org/wiki/The_Perennial_Philosophy
> "In the early 19th century the Transcendentalists propagated the idea of a metaphysical Truth and universalism"
So it seems it was not a coincidence Emerson stuck out to me when I first read him (Emerson was a foundational Transcendentalist).
Speaking for myself, another reason I enjoy Buddhism and Stoicism is that they feel more like pure, distilled wisdom. Especially Zen Buddhism. Christian writings are filled with excessive moralizing and mythology, which enables all sorts of problems.
https://en.wikipedia.org/wiki/Greco-Buddhism
While there isn't much direct evidence to support this theory, both philosophies have some ideas related to mindfulness that are too similar to me to be a coincidence.
> God, grant me the serenity to accept the things I cannot change,
> courage to change the things I can,
> and wisdom to know the difference.
Wikipedia: https://en.wikipedia.org/wiki/Serenity_Prayer#Genuine_precur...
Unfortunately Christianity suffers from excessive moralizing and mythology, which turns me away from it. But it definitely has lines of thought that descended from stoic thinking.