“ If anyone does not admit that holy Mary is Mother of God (Theotókos), he is cut off from the Godhead. If anyone claims that Christ merely passed through Mary, as if passing through a channel, but denies that he was formed within her in a divine way (because there was no intervention of a man), and in a human way (that is, according to the laws of conception), he is equally godless.
If anyone says that a man was formed first, who only afterward was clothed with divinity, let him be condemned. For that would not be a generation of God but a denial of divine generation. If anyone introduces the notion of two sons, one born of God the Father and the other born of the Mother, instead of a single and identical Son, let him be deprived of the adoption of sons, promised to those who believe aright.?”Gregory Nazianzen, Letter 101; PG 37, 177 C-180 A.
Gambero, L., 1999. Mary and the Fathers of the Church 1st ed. Translated by Buffer, T., San Francisco: Ignatius Press. p. 162.