O Virgin Theotokos, rejoice
Mary, full of grace, the Lord is with thee.
Thou art blessed among women,
and blessed [is] the fruit of thy womb,
for thou hast given birth to the savior of our souls.
(Above is text sung in video taken from Luke 1:26f)
Ecumenical Council of Ephesus 431 AD
We confess, then, our Lord Jesus Christ, the only begotten Son of God, perfect God and perfect man, of a rational soul and a body, begotten before all ages from the Father in his Godhead, the same in the last days, for us and for our salvation, born of Mary the Virgin according to his humanity, one and the same consubstantial with the Father in Godhead and consubstantial with us in humanity, for a union of two natures took place. Therefore we confess one Christ, one Son, one Lord. According to this understanding of the unconfused union, we confess the holy Virgin to be the Mother of God (Greek: Theotokos; birth giver of God) because God the Word took flesh and became man and from his very conception united to himself the temple he took from her” (Formula of Union [A.D. 431]).