The 'O Antiphons' (an antiphon is a spoken response in a church service) have been used in liturgical Christian traditions since as far back as the sixth century. They are spoken before reading the Magnificat at Evening Prayer during the last seven days of Advent.
My thanks to Malcolm Guite for these poetic reflections. Here is the last one of the seven - for 23rd December: O Emmanuel – O Emmanuel (God with us)
O Emmanuel, Rex et legifer noster,
exspectatio Gentium, et Salvator earum:
veni ad salvandum nos, Domine, Deus noster.
O Emmanuel, our king and our lawgiver,
the hope of the nations and their Saviour:
Come and save us, O Lord our God.
O come, O come, and be our God-with-us
O long-sought With-ness for a world without,
O secret seed, O hidden spring of light.
Come to us Wisdom, come unspoken Name,
Come Root, and Key, and King, and holy Flame.
O quickened little wick so tightly curled,
Be folded with us into time and place,
Unfold for us the mystery of grace
And make a womb of all this wounded world.
O heart of heaven beating in the earth,
O tiny hope within our hopelessness
Come to be born, to bear us to our birth,
To touch a dying world with new-made hands
And make these rags of time our swaddling bands.