In this sermon, the speaker discusses the book of Revelation and its division into three parts: the things which have been seen, the things which are, and the things which shall be. The speaker emphasizes that we are currently in a morally dark world and as believers, we have a responsibility to be lightbearers. The sermon then focuses on the letter to the church in Ephesus, highlighting the Lord's character, his message to the church, and his promise to the overcomers. The speaker emphasizes the importance of understanding that the Lord sees and knows our works, and encourages authenticity and sincerity in our faith.