" Why do you suppose the poets talk about hearts?' he asked me suddenly. 'When they discuss emotional damage? The tissue of hearts is tough as a shoe. Did you ever sew up a heart?' I shook my head. 'No, but I've watched. I know what you mean.' The walls of a heart are thick and strong, and the surgeons use heavy needles. It takes a good bit of strength, but it pulls together neatly. As much as anything it's like binding a book. "