O magnum mysterium, et admirabile sacramentum, ut animalia viderent Dominum natum, jacentem in praesepio!
Beata Virgo, cujus viscera meruerunt portare Dominum Christum. Alleluia.
O great mystery, and wonderful sacrament, that animals should see the newborn Lord, lying in a manger!
Blessed is the Virgin whose womb was worthy to bear Christ the Lord. Alleluia!
Responsory to the Fourth Lesson, Matins, Christmas Day