Have you ever had heartburn?
It is caused from acid reflux. The acids from the stomach return into the esophagus and cause a burning sensation.
Or is heart burn a certain kind of zeal or passion? You burn from within with passion and conviction about a certain decision or belief? You are decided and the strength of your decision is undivided.
Imagine you are in a crowded room. The floor is hard to discern because so many feet cover it. But the room clears and you are the only one left and you