Fire, in the spiritual sense, can mean either love or hatred depending on the context, just as natural fire can be either comforting in keeping you warm, or scary in burning down your house. Our language reflects this, too -- we use concepts like a smoldering hatred or a burning love. So fire signifies a love, either a good love of the neighbor and to the Lord, or, in a bad sense, selfish love of oneself that, if unchecked by conscience, leads to hatred of anyone that opposes it.

94. There are some in excrementitious hells who have been given to variety, and by this have extinguished the conjugial, and are at the same time voluptuaries; these are in the province of the intestines, underneath them, where there are lavatories everywhere and a foul smell; and everywhere there are caverns from which this smell escapes.