St. Francis may have used the prayer but he is not the verified source of the prayer. From wikipedia link in one of the replies to your post: "The prayer has been variously attributed, without evidence, to Thomas Aquinas, Cicero, Augustine, Boethius, Marcus Aurelius, and Francis of Assissi". The philosophy embedded in all of the versions we see comes from the Ancient Greek Stoicism.
That is the prayer of St. Francis! My mother had that on the wall for many years when I was growing up.
St. Francis may have used the prayer but he is not the verified source of the prayer. From wikipedia link in one of the replies to your post: "The prayer has been variously attributed, without evidence, to Thomas Aquinas, Cicero, Augustine, Boethius, Marcus Aurelius, and Francis of Assissi". The philosophy embedded in all of the versions we see comes from the Ancient Greek Stoicism.
https://en.wikipedia.org/wiki/Serenity_Prayer