A panel discussion with Elisabeth Sifton, editor and publisher, and author of The Serenity Prayer: Faith and Politics in Times of Peace and War, a memoir of her father, Reinhold Niebuhr; Graham Allison, director of the Belfer Center for Science and International Affairs and Douglas Dillon Professor of Government; J. Bryan Hehir, president of Catholic Charities USA; and Richard Parker, lecturer in public policy, Kennedy School of Government and senior fellow, Joan Shorenstein Center.