It was something that either changed the entire direction of their or intensified the direction they were already heading. What all these people had was an intense encounter with God. So intense that it changed their very life. Let's Pray that we might feel His warmth right now.
Fire can and is a very destructive force.
Out of control fire can destroy with much malice. However, under complete control, fire can also be as powerful. There is no in between good and bad in this life we live. There are two forces that drive us in life. They are the Holy Ghost or the influences of Satan and his imps.