Are all terrorists religious fundamentalists? How can pacifists respond to devastating violence? These and other challenging questions are at the heart of Paul Lacey’s 2010 Swarthmore Lecture as he explores Quaker response to both terror and fundamentalism. He acknowledges the evil and devastation caused by terrorist acts, but argues for a more nuanced understanding of what might drive people to kill indiscriminately. Alive to the urgency of the challenges posed by terrorism and violent clashes of beliefs, Lacey does not shrink from criticizing faith and religion when they stand in the way of peace.