WWJD
JMJ
I wrote this article on 1/1/10--in Honor of this special celebration of The Church: The Solemnity of Mary, here are some thoughts on Mary--mother of Jesus, who is God, ergo Mary is the Mother of God--the "Theotokos".
To start--we must read Scripture from the eyes of the Hebrew people--it is written for them and by them, inspired by the Spirit, of course.
When the Messiah was to come, He was expected to restore the Davidic Kingdom. That kingdom had/has a set structure: A king to sit on the throne (foreshadowed by Solomon), a Queen Mother (Gebirah) to sit at the Kings side (foreshadowed by Bathsheba, 1 Kings 2), and a Prime Minister to run things (foreshadowed by Eliakim -Is 22). That has been fulfilled in the New Davidic Kingdom--Christ's Church: with Christ, its eternal King, Mary its forever Gebirah, and the line of Popes as the Prime Ministers (Matt 16:18)
Now on Mary as Theotokos--Mother of God--
Luke 1:43 - Elizabeth's use of "Mother of my Lord" (in Hebrew, Elizabeth used "Adonai" which means Lord God) is the equivalent of "Holy Mary, Mother of God" which Catholics pray in the Rosary. The formula is simple: Jesus is a divine person, and this person is God. Mary is Jesus' Mother, so Mary is the Mother of God (Mary is not just the Mother of Jesus' human nature - mothers are mothers of persons, not natures).
What did the earliest Christians think about the subject?
The Early Church Fathers on The Mother of God
The Early Church Fathers had no problem referring to Mary as the Mother of God. They saw it as a natural consequence of the Incarnation.
Irenaeus
The Virgin Mary, being obedient to his word, received from an angel the glad tidings that she would bear God (Against Heresies, 5:19:1 [A.D. 189]).
Hippolytus
[T]o all generations they [the prophets] have pictured forth the grandest subjects for contemplation and for action. Thus, too, they preached of the advent of God in the flesh to the world, his advent by the spotless and God-bearing (theotokos) Mary in the way of birth and growth, and the manner of his life and conversation with men, and his manifestation by baptism, and the new birth that was to be to all men, and the regeneration by the laver [of baptism] (Discourse on the End of the World 1 [A.D. 217]).
Gregory the Wonderworker
For Luke, in the inspired Gospel narratives, delivers a testimony not to Joseph only, but also to Mary, the Mother of God, and gives this account with reference to the very family and house of David (Four Homilies 1 [A.D. 262]). It is our duty to present to God, like sacrifices, all the festivals and hymnal celebrations; and first of all, [the feast of] the Annunciation to the holy Mother of God, to wit, the salutation made to her by the angel, “Hail, full of grace!” (ibid., 2).
Peter of Alexandria
They came to the church of the most blessed Mother of God, and ever-virgin Mary, which, as we began to say, he had constructed in the western quarter, in a suburb, for a cemetery of the martyrs (The Genuine Acts of Peter of Alexandria [A.D. 305]).
Methodius
Hail to you forever, you virgin Mother of God, our unceasing joy, for unto you do I again return. . . . Hail, you fount of the Son’s love for man. . . . Wherefore, we pray you, the most excellent among women, who boast in the confidence of your maternal honors, that you would unceasingly keep us in remembrance. O holy Mother of God, remember us, I say, who make our boast in you, and who in august hymns celebrate your memory, which will ever live, and never fade away (Oration on Simeon and Anna 7 [A.D. 305]).
Cyril of Jerusalem
The Father bears witness from heaven to his Son. The Holy Spirit bears witness, coming down bodily in the form of a dove. The archangel Gabriel bears witness, bringing the good tidings to Mary. The Virgin Mother of God bears witness (Catechetical Lectures 10:19 [A.D. 350]).
Ephraim the Syrian
Though still a virgin she carried a child in her womb, and the handmaid and work of his wisdom became the Mother of God (Songs of Praise 1:20 [A.D. 351]).
Athanasius
The Word begotten of the Father from on high, inexpressibly, inexplicably, incomprehensibly, and eternally, is he that is born in time here below of the Virgin Mary, the Mother of God (The Incarnation of the Word of God 8 [A.D. 365]).
Epiphanius of Salamis
Being perfect at the side of the Father and incarnate among us, not in appearance but in truth, he [the Son] reshaped man to perfection in himself from Mary the Mother of God through the Holy Spirit (The Man Well-Anchored 75 [A.D. 374]).
Ambrose of Milan
The first thing which kindles ardor in learning is the greatness of the teacher. What is greater than the Mother of God? What more glorious than she whom Glory Itself chose? (The Virgins 2:2[7] [A.D. 377]).
Gregory of Nazianz
If anyone does not agree that holy Mary is Mother of God, he is at odds with the Godhead (Letter to Cledonius the Priest 101 [A.D. 382]).
Jerome
As to how a virgin became the Mother of God, he [Rufinus] has full knowledge; as to how he himself was born, he knows nothing (Against Rufinus 2:10 [A.D. 401]).
Theodore of Mopsuestia
When, therefore, they ask, ‘Is Mary mother of man or Mother of God?’ we answer, ‘Both!’ The one by the very nature of what was done and the other by relation (The Incarnation 15 [A.D. 405]).
Cyril of Alexandria
I have been amazed that some are utterly in doubt as to whether or not the holy Virgin is able to be called the Mother of God. For if our Lord Jesus Christ is God, how should the holy Virgin who bore him not be the Mother of God? (Letter to the Monks of Egypt 1 [A.D. 427]).
John Cassian
You cannot then help admitting that the grace comes from God. It is God, then, who has given it. But it has been given by our Lord Jesus Christ. Therefore the Lord Jesus Christ is God. But if he is God, as he certainly is, then she who bore God is the Mother of God (On the Incarnation of Christ Against Nestorius 2:2 [A.D. 429]).
Council of Ephesus
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 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]).
With this I conclude with:
Hail Full of Grace, the Lord is with thee (Luke 1:28)
Blessed are you amoung women, and Blessed is the fruit of thy womb (Luke 1:42)
Hail Mary, Mother of God (Council of Ephesis 431 ad)
Pray for us sinners now, at the hour of our death (as she did for Jesus in John 19)
AMEN
Some materials from the Church Fathers taken from StayCatholic.com