In this sermon, the speaker reflects on their past experiences of being assigned to more militant topics. They then turn to the book of Nehemiah in the Old Testament to discuss facing opposition. The speaker emphasizes the importance of being dedicated to the work of God and being prepared to face opposition. They highlight the need to seal the borders and be ready to work, as well as maintaining the right attitude and being willing to combat opposition. The sermon also references verses from 1 Peter and Haggai to support these points.