The Unquenchable fire. This is the fire that Jesus Christ has clearly stated that the lost will be cast into. But what is this fire? Does it burn forever and not go out. Or is it a fire that man cannot put out but will eventually burn out when there is no more fuel for it to feed on? Read this study and see how the bible defines its own terms. Read that the palaces of Ancient Jerusalem were also destroyed with unquenchable fire.