Throughout the Great Depression, World War II and the Cold War, Niebuhr was one of the most prominent public voices of his time, probing with singular style the question of how to act morally in a fallen world. This volume, prepared by Niebuhr's daughter, Elisabeth Sifton, collects four indispensable books: Leaves from the Notebook of a Tamed Cynic (1929), Moral Man and Immoral Society (1932), The Children of Light and the Children of Darkness (1944) and The Irony of American History (1952), along with a selection of essays, sermons, lectures and prayers.