What drives passionate people to work so hard? Where do they get their energy from? Passion can be fueled by many factors. Let us examine 6 most important sources of the Force. Curiosity. One of the most powerful triggers of human invention has been curiosity. Why does something happen? How does lightning occur? What happens if you mix two chemicals? Which route will discover new lands? The human mind is programmed to question everything around it.Read to know more.