The sermon emphasizes that Jesus is the reason for our celebration, focusing on the fulfillment of God's promises, as shown in the birth of Christ. It draws parallels between David's reflections in Psalm 89 and the hope found in Luke 2, urging us to pause, reflect, and praise God, even in difficult circumstances. Through Jesus, we find restoration, Hope, and Joy which are not based on our circumstances but on God's unchanging love and faithfulness.