Saturday, 27 December 2025

The Divine Exchange of Christmas

Isaiah 52:7-10 ‘All the ends of the earth shall see the salvation of our God’

Hebrews 1:1-6 ‘God has spoken to us by his Son’

John 1:1-18 ‘The Word was made flesh, and dwelt among us’

 

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The birth of a child is always a time of awe and wonder.

 

Birth follows the moment of the conception of that child some nine months earlier.

 

We only celebrate Christmas Day, the nativity of Jesus Christ, because nine months ago, on 25th March, we celebrated the Annunciation to Mary, when she is overshadowed by the power of the Most High and the Holy Spirit, and the angel declares:

 

And behold, you, Mary, will conceive in your womb and bear a son, and you shall call his name Jesus. (Luke 1.31)

 

That is the moment of incarnation, when ‘the Word became flesh’: not yet born but already recognised, in the womb, by the unborn John the Baptist (Luke 1.41).

 

During Mary’s pregnancy, as with any pregnancy, the time of gestation, Jesus was hidden in her womb but will have become more and more obvious week by week.

 

And as with any human baby Jesus was nourished by his mother as he grew.

 

We often think of the child drawing life from his mother’s body; and indeed he does: but quite remarkably the child in the womb doesn’t just receive; it gives!

 

Scientists call this ‘foetal microchimerism’ or a ‘cellular exchange’.

 

It means that just as sustenance flows from the mother to the child, so also the child’s cells flow through the umbilical cord into the mother’s body.

 

The mother and baby are mutually enriched.

 

What a mystery and awesome thing this is.

 

So, Mary giving to Jesus by feeding him through the umbilical cord, and at the same time was receiving from him; receiving cells that would remain in her for the rest of her life.

 

The time of pregnancy is not just about decorating a nursery, or buying baby clothes, but is a time of deep inner formation too for mother and child: as has our spiritual formation in the season of Advent just passed.

 

In a similar way - even before Jesus Christ, the Word of God, took human flesh - God was gestating his Word in humanity:

 

‘Long ago, at many times and in many ways, God spoke to our fathers by the prophets’ opens the letter to the Hebrews, ‘but in these last days he has spoken to us by his Son’ (Hebrews 1.1).

 

Throughout the scriptures the prophets see, and wisdom declares that the Lord will act on his promise of the Good News that, ‘all the ends of the shall see the salvation of our God’ (Isaiah 52.10).

 

What scientists call a ‘cellular exchange’ between mother and yet to be born child, theologians call a ‘divine exchange’ between God and humanity.

 

Yes, Mary gives Jesus his humanity at the same time as her child, Jesus Christ gives to her - and to you and me - his divinity, so that, with her, we can be ‘partakers of the divine nature’ (2 Peter 1.4) and filled with grace.

 

As Hebrews continues:

 

He is the radiance of the glory of God and the exact imprint of his nature, and he upholds the universe by the word of his power. (Hebrews 1.3).

 

The exact imprint of God, Jesus Christ, dwelt in Mary’s womb, ready to be born in the manner of one of us, because he is at the same time, one of us: ’of one being with the Father…and was made man.’

 

This is all truly awesome and wonderful.

 

The ancient words of a psalm, written even before ultrasound scans were a thing, puts it like this:

 

For you yourself created my inmost parts;

you knit me together in my mother’s womb.

I thank you, for I am fearfully and wonderfully made;

marvellous are your works, my soul knows well. (Psalm 139.12,13)

 

Each, and every, human life – you, me, everyone - is ‘fearfully and wonderfully made’ and not only that, he or she is made in the image of God.

 

What Christmas is all about is that Jesus Christ is born with all the risk, trepidation and joy a birth entails to make those made in the image of God more deeply into God’s likeness.

 

He is not now solely carried by his mother in her womb, but can be picked up and handled by Joseph, by shepherds and by Magi, and in the deepest spiritual sense he can also be embraced by each one of us.

 

As we receive Holy Communion today that is what we are doing: we are opening ourselves to something much more than ‘foetal microchimerism’ or a ‘cellular exchange’ it is a divine and sacramental exchange going on: ‘where we dwell in him and he in us’.

 

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. (John 1,14)

 

In this wonder we are ‘birthed’ by God – and here is the nub of Christmas:

 

…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. (John 1.12,13)

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