Using heart transplantation as a metaphor, The Ultimate Donor illustrates what God has done for humanity through the death of Jesus. The paths of becoming a follower of Christ and a heart transplant recipient are similar. As with heart transplant recipients, followers of Christ experience times of diagnosis (knowledge of their sick heart), transplantation (replacing their sick heart with the heart of Christ) and living the post-transplant life (the disciplined life with their new heart). Every heart transplant demands the death of a donor. Fortunately, there is an Ultimate Donor.