A Canticle for Advent: O Great Mystery

The Nativity by Federico Fiori Barocci
The Nativity by Federico Fiori Barocci

O magnum mysterium et admirabile sacramentum
O magnum mysterium et admirabile sacramentum
Ut animalia viderent Dominum natum
Viderent Dominum natum
Jacentem in proesepio, jacentem in proesepio

O beata virgo, cujus viscera me ruerunt portare
Dominum Jesum Christum

Alleluja, Alleluja, Alleluja
Alleluja, Alleluja, Alleluja
Alleluja!

English translation:

O great mystery,
and wonderful sacrament,
that animals should see the new-born Lord,
lying in a manger!
Blessed is the Virgin whose womb
was worthy to bear
Christ the Lord.
Alleluia!
traditional chant from Matins, music from Morten Larudisen
http://www.youtube.com/watch?v=7KvrbYZB2vY
http://www.youtube.com/watch?v=9y9yM53TowA
Beyond all question, the mystery from which true godliness springs is great:

He appeared in the flesh,
    was vindicated by the Spirit,
was seen by angels,
    was preached among the nations,
was believed on in the world,
    was taken up in glory.
1Timothy 3:16

Perhaps it is the mystery of the thing that brings us back, again and again, to read the story.
How can this be?  God appearing on earth first to animals, then the most humble of humans.
How can He be?  Through the will of the Father and the breath of the Spirit, the Son was, and is and yet to be.

O great mystery beyond all understanding.