In this sermon, the preacher focuses on the verses from 1 Thessalonians 4:16 and Revelation 11:15, which provide a picture of the rapture, resurrection, judgment, and rewarding of the saints. The preacher emphasizes the importance of studying these verses and being aware of the enemy's attempts to blind our understanding. The sermon also references Matthew 24, where Jesus speaks about the events of the last days, including the darkening of the sun, the falling of stars, and the coming of the Son of Man in the clouds. The sermon concludes by highlighting the connection between the last trumpet, the first resurrection, and the events described in these verses.