Luther on Isaiah 9

That is why Isaiah says, “To us a child is born, to us a son is given.” It is like when women [approach a baby’s cradle and] say, “Oh, a baby! What is it?” And I answer, “It’s a boy—and he’s ours!” What an incredible thing to say, that all of us should somehow be the mothers of one whom we have not carried [in our womb]!He is given to us as though he were our own son. How proud and honored we are that he is our son, that he belongs to us. But it is not enough that he is “born” to us;he is also “given” to us. What does “given” mean? He is a [pure] gift, a present. There is nothing I have to give or pay in return. Woe to the godless and ungrateful world that disdains this gift.

from Martin Luther - Sermon preached Christmas afternoon, 1531.