The sermon centers on the joy found in Jesus Christ during Advent, emphasizing that true joy arises not from external circumstances but from recognizing Him as the promised Messiah who fulfills Scripture through acts of mercy, healing, and redemption. Drawing from John the Baptist's doubt while imprisoned—questioning whether Jesus was truly the coming one—the preacher highlights how Jesus responds by pointing to His works as fulfillment of Isaiah's prophecy, demonstrating that the Messiah's mission includes compassion and restoration, not just judgment. The message reassures believers that even in moments of spiritual weariness or doubt, faith is sustained not by human expectations but by Christ's faithful character, and that joy is found in surrendering to His story rather than trying to be the hero. The sermon calls listeners to share the gospel with others, trusting that the good news of Christ's love and victory brings transformation and eternal hope, and invites each person to let Jesus write their life story with confidence in His ultimate, joyful ending.