But what’s amazing about what we mean when we say “heart” or “soul” or “gut” is that we’re talking about a fact that humans have known since the very beginning of humanity. The idea of the “heart” — the idea that humans have this unseen causer in them, this inner self, this energy at the center of who they are — this is an ancient idea that goes back thousands and thousands of years ago, and you see it all over the place in the Bible.