The Children of Light and the Children of Darkness, first published in 1944, is considered one of the most profound and relevant works by the influential theologian Reinhold Niebuhr, and certainly the fullest statement of his political philosophy. Written and first read during the prolonged, tragic world war between totalitarian and democratic forces, Niebuhr's book took up the timely question of how democracy as a political system could best be defended. Most proponents of democracy, Niebuhr claimed, were "children of light," who had optimistic but naive ideas about how society could...