In 1934, an American theologian wrote a prayer for a sermon he was delivering. Reinhold Niebuhr’s short prayer has grown fairly well known over the years: God, give me grace to accept with serenity the things that cannot be changed, Courage to change the things which should be changed, and the Wisdom to distinguish the one from the other. Though it is generally presented with slightly different wording and has a second stanza, most people recognize it as the Serenity Prayer. The prayer is most famous for its association with Alcoholics Anonymous and other 12-Step Groups. The prayer is perfect...