Angels Appearing Before the Shepherds, Henry Osawa Tanner
One of my favorite Prefaces in the Sacramentary (the book of prayers for the Mass) is the Preface for Advent II. It's poetry and theology combined.
Father, all-powerful and ever-living God,
we do well always and everywhere to give You thanks
through Jesus Christ our Lord.
His future coming was proclaimed by all the prophets.
The virgin mother bore Him in her womb with love beyond all telling.
John the Baptist was His herald
and made Him known when at last He came.
in His love Christ has filled us with joy as we prepare to celebrate His birth,
so that when He comes He may find us watching in prayer,
our hearts filled with wonder and praise.
And so, with all the choirs of angels in heaven
we proclaim Your glory and join in their unending hymn of praise: