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.
Exodus 3:1-3
1
Now Moses was keeping the flock of Jethro, his father-in-law, the priest of Midian, and he led the flock to the back of the wilderness, and came to God's mountain, to Horeb.
2
The angel of Yahweh appeared to him in a flame of fire out of the midst of a bush. He looked, and behold, the bush burned with fire, and the bush was not consumed.
3
Moses said, "I will turn aside now, and see this great sight, why the bush is not burnt."
