The sermon examines Hebrews 7:11-17 to explain why the Levitical priesthood was insufficient for salvation, necessitating a new priest in the order of Melchizedek. It argues that the promise in Psalm 110 points to a Messiah who possesses an indestructible life, enabling him to serve as a priest forever. This eternal priesthood is contrasted with the temporary nature of the Aaronic line, highlighting the superiority of Jesus, who is both king and priest. The teaching connects this to the Davidic covenant in 2 Samuel 7, showing how Jesus fulfills the role of an eternal king and priest through his resurrection. Ultimately, the message affirms that Jesus alone provides the salvation that the old covenant could not achieve.