How can a womb contain Him Whom nothing can contain?
How can He remain in His Father’s bosom, yet rest in His Mother’s arms?
It is His good pleasure to accomplish this.
Having no flesh, He purposely assumes it for our sake.
HE WHO IS becomes what He never was.
He shares our substance without forsaking His own nature.
Desiring to make us citizens of the world on high,
Christ, the Only-begotten of the Father, is born on earth as a man.

-From Matins for Nativity