Arcana Coelestia #1297
1297. 'And let us burn them thoroughly' means the evils that stem from self-love. This is clear from the meaning of 'to burn, a burning, fire, sulphur, and bitumen' in the Word, where they have reference to evil desires, chiefly to those that belong to self-love, as in Isaiah,
Our holy house, and our splendour, where our fathers praised You, has been made into a blaze of fire, and all our pleasant places have been made into a waste. Isaiah 64:11.
In the same prophet,
Conceive chaff, bring forth stubble. Your wind is a fire that will consume you. Thus the peoples will be burnings of lime; [like] thorns cut down they will be burned in the fire. Isaiah 33:11-12.
And there are many other examples besides these. 'Burning' and 'fire' have reference to evil desires because they possess similar characteristics.
Isaiah 54:11-13
11
"You afflicted, tossed with storms, and not comforted, behold, I will set your stones in beautiful colors, and lay your foundations with sapphires.
12
I will make your pinnacles of rubies, and your gates of sparkling jewels, and all your walls of precious stones.
13
All your children shall be taught of Yahweh; and great shall be the peace of your children.
