Once the topic of the soul was touched upon, both Leo and John became interested. Leo because he himself was looking for ways to stabilize his soul, while John because it was such a rare topic for low level cultivators. Even at higher realms, while it was more important to take note of, rarely would anyone specifically focus on it.
Harry sent John the MP, which prompted him to wake from his stupor.
"If you're interested in the soul, you're very lucky to have met me. Few people are as knowledgeable about the soul as I. It's not a topic many focus on. Let's start with what the soul actually is.
"The soul is the very foundation for any living being. A being can live without a spirit, and it can live without a body, and occasionally even without both, but in order for a being to be alive it must have a soul!