Fire is related to destruction and, because of this, it is associated with punishment.
The exact time of the coming day of the Lord will come as a surprise to the world. This is what the simile “like a thief in the night” means. Because of this, Christians are to be prepared for the coming of the Lord. (See: rc://en/tw/dict/bible/kt/dayofthelord and rc://en/ta/man/translate/figs-simile)
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