Apocalypse Explained # 241
241. Verse 18. I counsel thee, signifies the means of reformation of those who are in the doctrine of faith alone. This is evident from what now follows, for the reformation of those who are in that doctrine is now treated of; therefore "I counsel thee" implies precepts as to how such must live that they may be reformed and thus saved.
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.