The anti-Catholics argued that the dogma of Mary as the Mother of God was only invented by the Holy Catholic Church in AD 431 and is not an apostolic teaching. This claim was based on the historical definition made by the Ecumenical Council of Ephesus in response to the heresy of Nestorius, patriarch of Constantinople, that the Virgin Mary may be called the Christotokos (Birth Giver of Christ) but not the Theotokos (Birth Giver of God). Hence, the sacred council decreed: “If anyone does not confess that God is truly Emmanuel, and that on this account the Holy Virgin is the Mother of God (for according to the flesh she gave birth to the Word of God become flesh by birth), let him be anathema.” However, how can this teaching be a 5th-century invention only if it has already been taught prior to that period?!
Thus, below are the unanimous teaching of the early Christian leaders on Mary:
Irenaeus, bishop of Lugdunum in Gaul
“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, presbyter of Rome
“[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, bishop of Neocaesarea
“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, bishop 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]).
“We acknowledge the resurrection of the dead, of which Jesus Christ our Lord became the firstling; he bore a body not in appearance but in truth derived from Mary the Mother of God” (Letter to All Non-Egyptian Bishops 12 [A.D. 324]).
Methodius, bishop of Olympus
“While the old man [Simeon] was thus exultant, and rejoicing with exceeding great and holy joy, that which had before been spoken of in a figure by the prophet Isaiah, the holy Mother of God now manifestly fulfilled” (Oration on Simeon and Anna 7 [A.D. 305]).
“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” (ibid., 14).
Cyril, bishop 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, deacon
“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, bishop of Alexandria
“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, bishop 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, archbishop 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 [A.D. 377]).
Gregory of Nazianzus, patriarch of Constantinople
“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, presbyter of Rome
“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]).
“Do not marvel at the novelty of the thing, if a Virgin gives birth to God” (Commentaries on Isaiah 3:7:15 [A.D. 409]).
Theodore the Interpreter, bishop 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, patriarch 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]).
“This expression, however, ‘the Word was made flesh’ [John 1:14], can mean nothing else but that he partook of flesh and blood like to us; he made our body his own, and came forth man from a woman, not casting off his existence as God, or his generation of God the Father, but even in taking to himself flesh remaining what he was. This the declaration of the correct faith proclaims everywhere. This was the sentiment of the holy Fathers; therefore they ventured to call the holy Virgin ‘the Mother of God,’ not as if the nature of the Word or his divinity had its beginning from the holy Virgin, but because of her was born that holy body with a rational soul, to which the Word, being personally united, is said to be born according to the flesh” (First Letter to Nestorius [A.D. 430]).
“And since the holy Virgin corporeally brought forth God made one with flesh according to nature, for this reason we also call her Mother of God, not as if the nature of the Word had the beginning of its existence from the flesh” (Third Letter to Nestorius [A.D. 430]).
John Cassian, monk and theologian
“Now, you heretic, you say (whoever you are who deny that God was born of the Virgin), that Mary, the Mother of our Lord Jesus Christ, cannot be called the Mother of God, but the Mother only of Christ and not of God—for no one, you say, gives birth to one older than herself. And concerning this utterly stupid argument . . . let us prove by divine testimonies both that Christ is God and that Mary is the Mother of God” (On the Incarnation of Christ Against Nestorius 2:2 [A.D. 429]).
“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” (ibid., 2:5).
THE Ecumenical Council of Ephesus further taught, in its Formula of Union, the following:
“. . . 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.”
Even the prominent figure of the 16th-century Protestant Reformation, Martin Luther, also shared the same belief with the Holy Catholic Church regarding Mary’s motherhood of God, thus professed:
“[S]he became the Mother of God, in which work so many and such great good things are bestowed on her as pass man’s understanding. For on this there follows all honor, all blessedness, and her unique place in the whole of mankind, among which she has no equal, namely, that she had a child by the Father in heaven, and such a Child . . . Hence men have crowded all her glory into a single word, calling her the Mother of God . . . None can say of her nor announce to her greater things, even though he had as many tongues as the earth possesses flowers and blades of grass: the sky, stars; and the sea, grains of sand. It needs to be pondered in the heart what it means to be the Mother of God.”
Just as how Martin Luther and the early Christians would confess with the Holy Catholic Church: If Jesus Christ is One, Eternal and unchangeable divine Person—God—and Mary is His mother, then Mary is the Mother of that One, Eternal and unchangeable Person—God.