Their names were synonymous with eternal love and charity. They were celebrated for the difference they made in the world, both during their lifetimes and in the afterlife.

One day, while on a trip to Asia, they were approached by a young couple who were about to start their own family. "We've heard so much about your story and your work and we want to follow in your footsteps," the young woman said. "Can you please give us some advice?"

Axel and Bella were touched by the couple's request, and they agreed to meet with them. Over the next few days, they spent time with the couple, talking through their...