What you say is not only the central tenet of stoicism but also the not widely understood meaning of the serenity prayer, which each stand for all we can control are our own attitudes and reactions, and once people understand that, many resentments of others fall by the wayside. https://medium.com/channspirations/the-serenity-prayer-df758d99c956

https://medium.com/poetry-love/of-stoicism-f4aa545326da

https://medium.com/my-selection/my-selection-alcoholics-anonymous-colloquially-known-as-the-big-book-638b5ad7f2e1

https://medium.com/channspirations/who-decides-what-is-fair-c252486bcad8