"It cannot be denied that God in choosing and destining Mary to be the Mother of His Son, granted her the highest honor.... Elizabeth calls Mary Mother of the Lord, because of the unity of the person in the two natures of Christ was such that she could have said that the mortal man engendered in the womb of Mary was at the same time the eternal God"
John Calvin: Calvini Opera, Corpus Reformatorum, Braunschweig-Berlin, 1863-1900, Vol. 45, page 335 and 348.
"In this work whereby she was made the Mother of God, so many and such good things were given her that no one can grasp them.... Not only was Mary the mother of Him who is born [in Bethlehem], but of Him who, before the world, was eternally born of the Father, from a Mother in time and at the same time man and God."
Martin Luther: Weimer, The Works of Luther, English translation by Pelikan, Concordia, St. Louis, Vol. 7, page 572.
"It was given to her what belongs to no creature, that in the flesh she should bring forth the Son of God."
Ulrich Zwingli: Zwingli Opera, Corpus Reformatum, Berlin, 1905, in Evang. Luc., Op. Comp, Vol. 6, I, page 639.