When we are inclined to boast of our position [as Christians] we should remember that we are but Gentiles, while the Jews are of the lineage of Christ. We are aliens and in-laws; they are blood relatives, cousins, and brothers of our Lord. Therefore, if one is to boast of flesh and blood the Jews are actually nearer to Christ than we are.

That Jesus Christ Was Born a JewLuther's Works, American Edition (Philadelphia: Fortress Press, 1962), Volume 45, Page 201.