Paul’s two letters to the Thessalonians talk extensively about the second coming of Christ. The book of Revelation describes two main aspects to this second coming: A rational understanding of God is unveiled in Revelation 10 and 11 leading to a theoretical return of Christ at the end of Revelation 11. This rational understanding is then extended to all aspects of society, leading finally to a concrete return of Christ in Revelation 19.
1 Thessalonians is written to a group of individuals who are attempting to follow a rational concept of God before the events of Matthew 24, while 2 Thessalonians is written to a group right after the events of Matthew 24, in which the challenge is to apply the rational understanding that has just been unveiled. I have added a 30 page discussion of 1 & 2 Thessalonians to the end of the essay on Matthew 24.