Approved by the Council of Ephesus, AD 431.
“To the most religious and beloved of God, fellow minister Nestorius, Cyril sends greeting in the Lord . . .
The holy and great Synod therefore says, that the only begotten Son, born according to nature of God the Father, very God of very God, Light of Light, by whom the Father made all things, came down, and was incarnate, and was made man, suffered, and rose again the third day, and ascended into heaven. These words and these decrees we ought to follow, considering what is meant by the Word of God being incarnate and made man.
For we do not say that the nature of the Word was changed and became flesh, or that it was converted into a whole man consisting of soul and body; but rather that the Word having personally united to himself flesh animated by a…