In this sermon, the preacher focuses on the book of Revelation and the events that occur after the sixth seal is opened. He emphasizes that from this point on, everything becomes supernatural and no longer the result of a fallen world. The preacher describes the pouring out of God's wrath and the beginning of the day of the Lord. He highlights the devastation and destruction that takes place, including the death of a fourth of the population, persecution of the church, and various natural disasters. The preacher also mentions the significance of the silence in heaven before the storm of God's wrath is unleashed.