by St. Gregory of Nazianzus (AD 380)
Christ is born, glorify Him. Christ from heaven, go out to meet Him. Christ on earth, be exalted. Sing to the Lord, all the whole earth; and that I may join both in one word, let the heavens rejoice, and let the earth be glad, for Him who is of heaven and then of earth. Christ in the flesh, rejoice with trembling and with joy; with trembling because of your sins, with joy because of your hope.
Again, the darkness is past; again, Light is made; again, Egypt is punished with darkness; again, Israel is enlightened by a pillar. The people who sat in the darkness of ignorance, let them see the great Light full of knowledge. Old things have passed away; behold, all things have become new. The letter gives way, the Spirit comes to the front. The shadows flee away, the truth comes in on them. Melchizedek is concluded. He who was without Mother becomes without Father (without mother of His former state, without father of His second).
The laws of nature are upset; the world above must be filled. Christ commands it, let us not set ourselves against Him. O, clap your hands together, all you people, because unto us a Child is born, and a Son given unto us, whose government is upon His shoulder (for with the cross, it is raised up), and His name is called The Angel of the Great Counsel of the Father.
Let John cry, prepare the way of the Lord; I, too, will cry the power of this Day. He who is not carnal is Incarnate; the Son of God becomes the Son of Man, Jesus Christ, the same yesterday, and today, and forever. Let the Jews be offended, let the Greeks deride; let heretics talk until their tongues ache. Then shall they believe, when they see Him ascending into heaven; and if not then, yet when they see Him coming out of heaven and sitting as Judge.