The work of a lifetime, from one of the world's most influential thinkers, about the heart of the christian faith. "I could never myself believe in god, if it were not for the cross. In the real world of pain, how could ...The work of a lifetime, from one of the world's most influential thinkers, about the heart of the christian faith. "I could never myself believe in god, if it were not for the cross. In the real world of pain, how could one worship a god who was immune to it?