Erlo Stegen emphasizes the sovereignty of God in the birth of Jesus, illustrating how even a powerful ruler like Caesar Augustus was used to fulfill God's prophecy. Despite the difficult circumstances surrounding Jesus' birth in a stable, it highlights the humility and love of God in sending His Son to save humanity from sin. The sermon draws a parallel between the wild geese and mankind, showing how Jesus became human to lead us to salvation. Stegen challenges listeners to reflect on their response to Jesus, who was born to save us, and to consider the implications of continuing in sin after encountering Him. The message concludes with a reminder of God's desire to guide us into safety and eternal life.