The preface that follows is said in the Mass from the first Sunday of Advent to December 16th:
Father, all-powerful and ever-living God,
we do well always and everywhere
to give you thanks
through Jesus Christ our Lord.
When he humbled himself to come among us as a man,
he fulfilled the plan you formed long ago and opened for us the way to salvation.
Now we watch for the day,
hoping that the salvation promised us will be ours
when Christ our Lord will come again in his glory.
And so, with all the choirs of angels
we proclaim your glory
and join in their unending hymn of praise:
Holy, holy, holy, Lord...
(Taken from the Daily Roman Missal, Scepter Publishers, 1998)
Come Lord Jesus!