Emmanuel. God with us. Jesus. God is my salvation. God came to be with us, to be one of us, in order to save us. A sacrilegious idea, according to many! But God has never conformed His plans to our ideas of what is right. We are incapable of saving ourselves, so God came down to do it for us – not because of works done by us in righteousness, but according to His own mercy.
The LORD… saw that there was no one, He was appalled that there was no one to intervene; so His own arm worked salvation for Him, and His own righteousness sustained Him. Isaiah 59:16
The glory of the LORD that filled the tabernacle with a cloud by day and fire by night, came to fill a humble manger, and then a cross – and we have seen his glory. We cannot comprehend the mystery of the incarnation, how God could come and dwell with us. We do not have to understand – our part is only to repent and believe.
For this is what the high and lofty One says – he who lives forever, whose name is holy: I live in a high and holy place, but also with him who is contrite and lowly in spirit, to revive the spirit of the lowly and to revive the heart of the contrite. Isaiah 57:15
The Old Testament lesson is from the book of Exodus, chapter 40, verses 17-21 and 34-38:
In the first month in the second year, on the first day of the month, the tabernacle was erected. Moses erected the tabernacle. He laid its bases, and set up its frames, and put in its poles, and raised up its pillars. And he spread the tent over the tabernacle and put the covering of the tent over it, as the Lord had commanded Moses. He took the testimony and put it into the ark, and put the poles on the ark and set the mercy seat above on the ark. And he brought the ark into the tabernacle and set up the veil of the screen, and screened the ark of the testimony, as the Lord had commanded Moses…
Then the cloud covered the tent of meeting, and the glory of the Lord filled the tabernacle. And Moses was not able to enter the tent of meeting because the cloud settled on it, and the glory of the Lord filled the tabernacle. Throughout all their journeys, whenever the cloud was taken up from over the tabernacle, the people of Israel would set out. But if the cloud was not taken up, then they did not set out till the day that it was taken up. For the cloud of the Lord was on the tabernacle by day, and fire was in it by night, in the sight of all the house of Israel throughout all their journeys.
The Epistle lesson is from Titus, chapter 3, verses 4-7:
But when the goodness and loving kindness of God our Savior appeared, he saved us, not because of works done by us in righteousness, but according to his own mercy, by the washing of regeneration and renewal of the Holy Spirit, whom he poured out on us richly through Jesus Christ our Savior, so that being justified by his grace we might become heirs according to the hope of eternal life.
The Gospel for the Nativity of Our Lord is from John, chapter 1, verses 1-14:
In the beginning was the Word, and the Word was with God, and the Word was God. He was in the beginning with God. All things were made through him, and without him was not any thing made that was made. In him was life, and the life was the light of men. The light shines in the darkness, and the darkness has not overcome it.
There was a man sent from God, whose name was John. He came as a witness, to bear witness about the light, that all might believe through him. He was not the light, but came to bear witness about the light.
The true light, which gives light to everyone, was coming into the world. He was in the world, and the world was made through him, yet the world did not know him. He came to his own, and his own people did not receive him. But to all who did receive him, who believed in his name, he gave the right to become children of God, who were born, not of blood nor of the will of the flesh nor of the will of man, but of God.
And the Word became flesh and dwelt among us, and we have seen his glory, glory as of the only Son from the Father, full of grace and truth.

The Glory of God Fills the Tabernacle, from the Phillip Medhurst Collection of Bible illustrations, Revd. Philip De Vere [CC BY-SA 3.0]