Council of Ephesus

Herein we must beware of the error of Nestorius, who thus speaks; "When Divine Scripture is to speak either of the birth of Christ which is of the Virgin Mary, or His death, it is never seen to put God, but either, Christ, or Son, or Lord; since these three are significative of the two natures, sometimes of this, sometimes of that, and sometimes of both this and that together. And here is a testimony to this, Jacob begot Joseph the husband of Mary, of whom was born Jesus, who is called Christ. For God the Word needed not a second birth of a woman."