The material body is a combination of earth, water, fire, air and ether. There is already fire within the body, and our practical experience is that the heat of this fire sometimes increases and sometimes decreases. The fire within the bodies of the sons of Sagara Maharaja became so much hotter that all of them burned to ashes. The fires increased heat was due to their misbehavior toward a great personality. Such misbehavior is called mahad-vyatikrama. They were killed by the fire of their own bodies because of insulting a great personality.