Fire
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.
Isaiah 34:8-10
8
For Yahweh has a day of vengeance, a year of recompense for the cause of Zion.
9
Its streams will be turned into pitch, its dust into sulfur, And its land will become burning pitch.
10
It won't be quenched night nor day. Its smoke will go up forever. From generation to generation, it will lie waste. No one will pass through it forever and ever.