Pope St. Gregory the Great on the Birth of Christ

[On the night of Our Savior's Birth] The Angel announces that a king is born, and the choirs of angels join their voices, and rejoicing together they cry, 'Glory to God in the highest, and on earth peace to those of good will.' Before our redeemer was born in the flesh there was a discord between us and the angels, from whose brightness and purity we stood afar, not only as the result of original sin but also because of our daily offenses. Because through sin we had become strangers to God, the angels as God's subjects had cut us off from their fellowship. But because we have now acknowledged our King, the angels have received us as fellow citizens.

― St. Gregory the Great 

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Collect Prayer for the Nativity of the Lord

Almighty ever-living God, who gladdens us year by year as we wait in hope for our redemption grant that, just as we joyfully welcome your Only Begotten Son our Redeemer, we may also merit to face him confidently when he comes again as our Judge. Who reigns with you in the unity of the Holy Spirit one God Amen.