Here are two mysteries for the price of one—
the plurality of persons within the unity of God,
and the union of Godhead and manhood in the person of Jesus.
It is here, in the thing that happened at the first Christmas,
that the profoundest and most unfathomable depths of the Christian revelation tie.
“The Word became flesh,” John 1:14; God became man; the divine Son became a Jew;
the Almighty appeared on earth as a helpless human baby, unable to do more than lie and stare and wriggle and make noises, needing to be fed and changed and talked to like any other child.
And there was no illusion or deception in this:
the babyhood of the son of God was reality.
The more you think about it, the more staggering it gets. Nothing in fiction is so fantastic as is this truth of the incarnation.
—J. I. Packer, Knowing God, 58