"Thus God the Word himself, when he had been conceived and born in the flesh, showed Mary the Mother of God to be the one who had given birth to the Word endued with a body; and it was in accord with what is better and wonderful that she was named, since the mystery itself consisted in this - namely, the kingship of what is better, and the lifting up of our race from this place, and its transformation into something better."
St Severus of Antioch, Text 15 Homily XIV Translated from PO 38/2: 400-15
"But that the teachings of the God-clad Fathers agree with these things, hear again the quotation, which is inspired by God, of Cyril, who says as follows in the Treatise of Address to the God-fearing emperor Theodosius: “Is it not then already known—for it is not unknown to anyone at all—that the Only-Begotten became like us, that is, fully man, in order that he might set free our earthly body from intrusive corruption, imparting his own life to it, in the economy through the union.
But he made the human soul his own that he might show it superior to sin, and he imparted to it the firmness and unchangeableness of his own nature, as dye in a fleece."
St Severus of Antioch, Letter I of Severus to Sergius the Grammarian