BuDhaGirl Frond All Weather Bangle bracelets are made of polyvinyl carbonate tubing that is a semi-flexible material, so there is a little give when you slide the bangles over your hand. The key to deciding your size...how the bangles go over your hand, not the size of your wrist.
The Serenity Prayer is not new, although in modern times it is attributed to Reinhold Niebuhr. Epictetus had a version, the Jewish philosopher Solomon ibn Gabirol had a version, and even W.W. Bartley had a version with a Mother Goose rhyme dated 1695. The prayer is simple yet powerful:
God grant me the serenity to accept the things I cannot change, the courage to change the things I can, and wisdom to know the difference.