Chuck Smith emphasizes the sovereignty of Christ by exploring the concept of authority and submission through the example of centurions in the Bible. He highlights that true authority comes from being under authority, as demonstrated by Christ who submitted to the will of the Father. Smith challenges listeners to examine to whom they submit their lives, whether it be the world, flesh, or the devil, and encourages them to submit to Christ for true reign and responsibility. The sermon calls for self-control and the importance of ruling one's spirit as a reflection of submission to Christ. Ultimately, it is a call to recognize Christ as the ultimate Sovereign in our lives.