Corrections on the Day of the Lord-Part 2

False teaching about being in the day of the Lord had caused the Thessalonians to be "shaken in mind and disturbed." Paul removes their fear by correcting the teaching by directly tying the Lord's appearing and the rapture (vs. 1) to the day of the Lord and the events which will mark whether they were in it or not - the apostasia and revelation of the man of lawlessness.