It is a very engaging book that argues that violence has declined through the centuries. The author presents a formidable case, based upon an analysis of history, psychology, and the data, to make the case that the human condition has improved, and not worsened, due to the forces of civilization and enlightenment. This book looks at what has been creating this positive trend and pins it down to empathy, self-control, and moral sense. It changes common perceptions about the state of the world, giving one hope and explaining how society can continue to move forward to peace.