A scene from Bunyan's Pilgrim's Progress portrays Interpreter bringing Christian to a wall where fire is blazing from a grate. A man is trying to douse the fire with water. Then Interpreter shows Christian the other side of the wall, where another man is secretly pouring oil on the fire to keep it ablaze. Interpreter says, "You saw the man standing behind the wall to maintain the fire, teaching you that it is hard for the tempted to see how this work of grace is maintained in the soul." Satan tries to quench faith, but Christ keeps it alive.