In 1943, the renowned theologian Reinhold Niebuhr wrote a prayer for a church service in a New England village. Its appeal for grace, courage, and wisdom soon became famous the world over. Here, Elisabeth Sifton, Niebuhr's daughter, reclaims the true history of the Serenity Prayer and, in a poignant narrative, tells of efforts made by the brave men and women who, like Niebuhr, devoted their lives to the causes of social justice, racial equality, and...