What do the angels' announcements about Christ's birth signify?

The angels’ declaration during Christ's birth serves as a pivotal moment in salvation history, transforming the night of despair into a dawn of hope. When they proclaimed, 'Fear not, for behold, I bring you good tidings of great joy' (Luke 2:10), they revealed Christ as the Savior to be born to mankind, signifying God's active involvement in bringing salvation. This announcement not only emphasizes the joy and peace that Christ brings but also highlights the inclusiveness of the Gospel, as it is meant for all people—Jew and Gentile alike. The angels' messengers illustrate the significance of Christ coming into a world shrouded in darkness, as His birth is the initiation of God's redemptive plan to reconcile fallen humanity to Himself.