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.

116. THE SUN IN HEAVEN.

In heaven neither the sun of the world, nor anything from that sun, is seen, because it is wholly natural. For nature has its beginning from that sun, and whatever is produced by means of it is called natural. But the spiritual, to which heaven belongs, is above nature and wholly distinct from what is natural; and there is no communication between the two except by correspondences. What the distinction between them is may be understood from what has been already said about degrees (38), and what the communication is from what has been said in the two preceding chapters about correspondences.