In this sermon, the preacher focuses on the passage from John 4:34-38 where Jesus talks about doing the will of God and finishing His work. The preacher emphasizes the urgency of sharing the gospel and not waiting for certain conditions or qualifications to do so. He encourages the audience to open their eyes and see the ripe fields ready for harvest, referring to the people who need to hear the message of salvation. The preacher also shares a personal experience of sharing the gospel with a telemarketer and highlights the importance of preaching the good news to all creation.