Most people come and go without notice. Really important people have a herald announce them a minute before they arrive. As the time came for Jesus to be born, God sent a mighty angel from heaven, to the center of His temple, over a year in advance, to announce the birth of the one who would announce the ministry of the Lord Jesus. What a great King Luke prepares us for! And Jesus is the King who not only proclaims His salvation to us, but who calls us to be His heralds to the nations.