In this sermon, Will Butt discusses the failings of the church as outlined in Revelation 3, focusing on the messages to the churches of Sardis, Laodicea, and Philadelphia. He emphasizes the importance of living out one's faith actively, addressing real-world issues such as human trafficking and abortion, and encouraging the church community to take action. The sermon highlights the need for believers to be the light in the world and to respond to God's call with obedience and love.