"But in all the holy Scriptures He joins together and as it were incorporates in the Godhead, the Lord's manhood, so that no one can sever man from God in time, nor God from man at His Passion. For if you regard Him in time, you will find that the Son of man is ever with the Son of God. If you take note of His Passion, you will find that the Son of God is ever with the Son of man, and that Christ the Son of man and the Son of God is so one and indivisible, that, in the language of holy Scripture, the man cannot be severed in time from God, nor God from man at His Passion....There was not then before the birth of a Virgin the same eternity belonging in the past to the manhood as to the Divinity, but because Divinity was united to manhood in the womb of the Virgin, it follows that when we use the name of Christ one cannot be spoken of without the other."
~St. John Cassian (c. 360-c. 435): On the Incarnation of the Lord, Against Nestorius, Bk. 6:22.
~St. John Cassian (c. 360-c. 435): On the Incarnation of the Lord, Against Nestorius, Bk. 6:22.