HT to Paul McCain for quotes about how Luther relates vocation to Christmas:
Here is another excellent and helpful lesson, namely, that after the shepherds have been enlightened and have come to a true knowledge of Christ, they do not run out into the desert-which is what the crazy monks and nuns in the cloisters did! No the shepherds continue in their vocation, and in the process they also serve their fellow men. For true faith does not create people who abandon their secular vocation and begin a totally different kind of living, a way of life which the totally irrational monks considered essential to being saved, even though it was only an externally different way of existence. [Klug, Luther’s House Postils, Vol. 1:48]
“We conclude, therefore, that a Christian lives not in Himself, but in Christ and in the neighbor. Otherwise he is not a Christian. He lives in Christ through faith, in his neighbor through love. By faith he is caught up beyond himself into God. By love he descends beneath himself into his neighbor.” “On the Freedom of a Christian,” (LW 31:371)
“These are the two things in which a Christian is to exercise himself, the one that he draws Christ into himself, and that by faith he makes him his own, appropriates to himself the treasures of Christ and confidently builds upon them; the other that he condescends to his neighbor and lets him share in that which he has received, even as he shares in the treasures of Christ.” 1521 Christmas sermon.