"I have come to do Your will, O God"
These were evidently Jesus' last words before He left heaven on that first advent.
Though I have never seen these words on a Christmas card, I can't think of a more meaningful Christmas text than Hebrews 10:5-7 (so we made one ourselves - see below). I remember when Jody Mayhew (who has been facilitating Prayer Summits for many years) mentioned that these words (from Psalm 40 and also Hebrews 10:7) should be "written in red" because they are the words of Jesus.
5 Therefore, when Christ came into the world, he said: “Sacrifice and offering you did not desire, but a body you prepared for me; 6 with burnt offerings and sin offerings You were not pleased. 7 Then I said, 'Here I am - it is written about me in the scroll - I have come to do Your will, O God.'"6
As we consider the significance of Jesus' coming into the world, this statement seems to summarize not only how Jesus approached His coming to earth, but also how we should approach it as well.