One Lord by economic union; Matthew: born of Spirit, saves his people

If we take the one from the woman as a separate person, we have denied the only Master. For there is one Lord Jesus Christ by an economic union — I mean with the Word from God — his flesh ascending into the glory of the deity. So there is one Christ and Son; and so he will be Master of all.

From Matthew’s Gospel — that Christ is God: “While he was considering these things, behold, an angel of the Lord appeared to him in a dream, saying: Joseph, son of David, do not fear to take Mary your wife, for what is begotten in her is from the Holy Spirit. She will bear a son, and you shall call his name Jesus, for he will save his people from their sins.”

In the same breath he sets down two things proper to God, and not fitting for human nature. Of the one born from Mary he said that those saved through him are his own people, and that he himself will also free them from sins. All things belong to God, and to him alone it would befit to be able to free sinners from sins. So the one begotten from the holy virgin is God, whose own people we are; and he has freed us from sins, as one who has authority for that too.

“Now when Jesus was born in Bethlehem of Judea.” In Bethlehem of Judea has been born the one from the root of Jesse. And God the Father says about him through one of the prophets: “And you, Bethlehem, house of Ephrathah, are by no means least among the thousands of Judah; for from you shall come forth for me one to be ruler in Israel, and his goings forth are from the beginning, from the days of eternity.”