It’s difficult to imagine our internal organs having an influence on how we feel. Most of us see emotions as responses to external situations, or internal thoughts. But what if our organs might have some part to play in the complex world of feelings? The ancient Greeks, for example, believed that the liver was the source of our emotions and the center of the soul. Even the words we use today to describe the liver like “hepatic,” “hepatitis,” and “hepatoma” come from the ancient Greek word “hepar,” which means liver. The ancient Greeks also knew, quite rightly, that the liver had the ability to regenerate, and they thought this was due to its divine nature. We can see this in Greek mythology with the story of the punishment of Prometheus. Zeus, angry at Prometheus, punished him by putting him in chains and sending an eagle to eat his liver. Because …