The Objection — In Brief
Evangelical and Reformed Protestants reject the Immaculate Conception — the doctrine that Mary, by a singular grace of God and in view of the merits of Christ, was preserved from original sin from the first moment of her conception. They insist that Mary was a sinner like everyone else, that she herself admitted it by calling God her “Savior,” and that the Bible says “all have sinned” with no exceptions.
Their Proof-Texts
Romans 3:23 — “For all have sinned and fall short of the glory of God.”
Luke 1:47 — “My spirit rejoices in God my Savior” — Mary herself calls God her Savior, implying she needed saving from sin.
Romans 5:12 — “Sin came into the world through one man, and death through sin, and so death spread to all men because all sinned.”
1 John 1:8 — “If we say we have no sin, we deceive ourselves, and the truth is not in us.”
Where Do the Traditions Stand?
Orthodox
Panagia; all-holy
Lutheran
Theotokos; deny IC
Anglican
Varies by tradition
Reformed
Reject; all have sinned
Non-denom.
Reject; unbiblical
Baptist
Reject; all have sinned
Pentecostal
Reject; Catholic invention
⚠ Test Your Objection
If “all have sinned” (Romans 3:23) admits no exceptions, then Jesus sinned — because Jesus is fully human and the “all” is the same “all.” Every Protestant agrees Christ is an exception. Most also exempt infants who die before the age of reason — they never committed personal sin, yet they are human. So the “all” already has at least two acknowledged exceptions. The question is not whether exceptions exist but whether God chose to make Mary one.
If calling God “my Savior” proves Mary was a sinner, then it also proves she was not saved without Christ — which is exactly what the Immaculate Conception teaches. She was saved by Christ preemptively, not remedially. She needed a Savior; she received the most perfect salvation possible.
If the New Eve must begin where Eve began, then Mary must begin without sin. Consider the parallels: Eve was a virgin — Mary was a virgin. Eve was visited by an angel (the fallen one) — Mary was visited by an angel (Gabriel). Eve was asked to accept a word — Mary was asked to accept the Word. Eve said yes to the serpent and brought death into the world — Mary said yes to God and brought Life into the world. Eve’s disobedience closed the gates of Paradise — Mary’s obedience opened them. The parallel runs in every detail — and Irenaeus saw it as early as 180 AD: “The knot of Eve’s disobedience was loosed by the obedience of Mary.” But for the parallel to hold, the starting point must be the same. Consider how the Adam-Christ typology works: Adam was sinless and chose sin; Christ was sinless and chose obedience. No Protestant says Christ started as a sinner who then overcame it — that would make him just another fallen son of Adam, not the New Adam. The antitype must match the type at the point of departure, then diverge at the point of decision. The same logic applies here: Eve was sinless and chose disobedience; Mary must be sinless and choose obedience. If Mary started in sin, the reversal is incomplete — she is overcoming a handicap Eve never had, and the symmetry breaks. The typology demands the Immaculate Conception.
If God required the Ark of the Covenant to be made of incorruptible materials — acacia wood overlaid with pure gold — because of what it housed, consider what it housed and whom they foreshadowed: the stone tablets (the Word of God — and Jesus is the Word made flesh), the manna (the bread from heaven — and Jesus is the true Bread of Life), and Aaron’s rod (the sign of the high priesthood — and Jesus is the eternal High Priest). The Ark carried the types of the Messiah, and God required it to be so holy that Uzzah died for merely touching it. Mary carried not the types but the reality they pointed to — God himself in the flesh. If the container of shadows required incorruptibility, how much more the vessel of the substance? God would surely require a pure dwelling for his Most Holy Son. And consider: when David encountered the Ark, he cried “How can the ark of the LORD come to me?” (2 Samuel 6:9). When Elizabeth encountered Mary, she cried “Why is this granted to me, that the mother of my Lord should come to me?” (Luke 1:43). David leaped before the Ark. John the Baptist leapt in the womb. Luke is not being subtle.
The doctrine of the Immaculate Conception does not claim Mary saved herself. It claims Christ saved her more perfectly than he saved anyone else — by preventing the disease rather than curing it.
✓ The Catholic Response — What These Texts Actually Mean
Romans 3:23 is a general statement about humanity’s condition, not a mathematical catalog of every individual. Paul’s argument in Romans 3 is about Jew-Gentile equality before God: “Are we Jews any better off? No, not at all; for we have already charged that all, both Jews and Greeks, are under sin” (Romans 3:9). The pantes (“all”) of v. 23 is the pantes of v. 9 — both ethnic groups, not a metaphysical absolute. Moreover, Paul shifts to polloi (“many”) in Romans 5:19, undercutting any strictly mathematical reading. If “all” is absolute, Jesus sinned. If Jesus is the obvious exception, the question becomes theological, not grammatical — and Catholic theology has a well-developed answer.
“Are we Jews any better off? No, not at all; for we have already charged that all, both Jews and Greeks, are under sin.” — Romans 3:9
Luke 1:47 — “God my Savior” — is evidence for the Immaculate Conception, not against it. The IC has never claimed Mary didn’t need a Savior. It claims Christ saved her preemptively rather than remedially. Bl. John Duns Scotus (d. 1308) articulated the distinction: if you are walking toward a pit and someone pulls you out after you fall, they saved you. If someone catches you before you fall, they also saved you — and more perfectly. Mary was saved by Christ from the front, not from behind. Ineffabilis Deus (1854) enshrines this: Mary was preserved “in view of the merits of Jesus Christ, Savior of the human race.” Mary calls God her Savior precisely because she was preserved. The verse is not a problem for the IC. It is exactly what the IC predicts she would say.
“My spirit rejoices in God my Savior.” — Luke 1:47
The Greek κεχαριτωμένη (kecharitomene) in Luke 1:28 describes a perfected, antecedent state of grace. The word is a perfect passive participle of charitoo (“to grace, to bestow grace upon”). The perfect tense in Greek denotes a completed action with continuing results — a state that began in the past and persists. The passive voice identifies God as the agent. Gabriel uses it not as a name but as a title: “Hail, Graced-One.” Even Protestant Greek scholars concede the force: A. T. Robertson (Word Pictures, 1930, II:13) writes that it means “endowed with grace, enriched with grace” and that the Vulgate gratiae plena “is right, if it means full of grace which thou hast received.” The grammar does not prove the IC alone — but it describes exactly the state the IC teaches.
“Hail, κεχαριτωμένη, the Lord is with you.” — Luke 1:28
Every proof-text against the Immaculate Conception, when examined in context and in the original Greek, either supports the doctrine or fails to exclude it. The IC is not refuted by Romans 3:23 read as a slogan. It is established by the convergence of Lucan typology, Scotist theology, and patristic witness.
The most sophisticated Protestant objection does not simply quote Romans 3:23. It argues that the IC is an unfalsifiable, extra-biblical construction that (a) rests on typological fittingness rather than explicit scriptural teaching, (b) generates an infinite regress (“if Mary needed to be sinless to bear Christ, why didn’t her mother need to be sinless?”), and (c) functions as a systematic extension of Rome’s nature-grace theology that ultimately competes with solus Christus by making Mary a “smaller-scale replica” of Christ.
The strongest version also notes that the doctrine was not universally held in the medieval period: Bernard of Clairvaux, Anselm of Canterbury, Bonaventure, and even Thomas Aquinas all objected to the IC in some form. If the greatest Catholic theologians of the Middle Ages denied it, how can it be called an ancient, universal teaching?
The strongest academic versions appear in Wayne Grudem, Systematic Theology (Zondervan, 1994), p. 531; R. C. Sproul, Are We Together? (Reformation Trust, 2012), ch. 6; Gregg Allison, Roman Catholic Theology and Practice (Crossway, 2014); and James R. White, Mary—Another Redeemer? (Bethany House, 1998).
The Immaculate Conception is the doctrine that Mary, from the first instant of her conception, was preserved from all stain of original sin by a singular grace of God, in view of the merits of Jesus Christ. It was solemnly defined by Pope Pius IX in Ineffabilis Deus on December 8, 1854. It does not mean Mary was conceived without a human father (that is the Virgin Birth of Christ, a different doctrine). It does not mean Mary saved herself. It means Christ saved her more perfectly than he saved anyone else — by preventing the wound rather than healing it.
Scotus and the Theology of Preventive Redemption. The theological breakthrough came from Blessed John Duns Scotus (d. 1308). The traditional objection — held by Bernard, Bonaventure, and even Aquinas — was that if Mary were preserved from original sin, she would not have needed redemption, and Christ’s universal saving work would be compromised. Scotus’s answer was devastating in its simplicity: Christ’s redemptive merit can be applied either remedially (curing sin already contracted) or preservatively (preventing sin from being contracted at all). The latter is a more perfect redemption, not a lesser one. The maxim associated with Scotus is potuit, decuit, ergo fecit — “God could do it, it was fitting, therefore he did it.” The perfect Mediator must have exercised the most perfect form of mediation in at least one case — and that case is Mary.
This is why Luke 1:47 (“God my Savior”) is not a problem for the IC but evidence for it. Mary calls God her Savior precisely because she was preserved by Christ’s merits. Ineffabilis Deus explicitly enshrines this: Mary was preserved “in view of the merits of Jesus Christ, Savior of the human race.” She is not an exception to Christ’s saving work. She is its most perfect instance.
The Ark of the Covenant — Luke’s Own Typology. This is not a Catholic devotional invention. It is a literary construction embedded in Luke’s Gospel by Luke himself. The parallels between 2 Samuel 6 and Luke 1:35–56 are too dense and too precise to be coincidental:
The power of the Most High “overshadowed” (episkiasei) Mary (Luke 1:35) — the same verb used in the LXX when the cloud “overshadowed” (epeskiazen) the Tabernacle (Exodus 40:35). Mary “arose and went” (anastasa… eporeuthe) into the hill country of Judah (Luke 1:39) — David “arose and went” (aneste… eporeuthe) with all the people to bring up the Ark (2 Samuel 6:2 LXX). Elizabeth cried: “Why is this granted to me, that the mother of my Lord should come to me?” (Luke 1:43) — David cried: “How can the ark of the LORD come to me?” (2 Samuel 6:9). John “leaped” in the womb (Luke 1:41) — David “leaped and danced” before the Ark (2 Samuel 6:16). Elizabeth “exclaimed with a loud cry” (anephonesen krauge megale) — and the verb anaphoneo appears in the LXX only in 1 Chronicles 15:28 and 16:4–5 of Levitical exclamation before the Ark. Mary remained three months (Luke 1:56) — the Ark remained three months in the house of Obed-edom (2 Samuel 6:11).
The contents of the old Ark — the stone tablets (Word of God), the manna (bread from heaven), Aaron’s rod (high-priestly emblem) — correspond to what Mary carried: the Word made flesh, the Bread of Life, the eternal High Priest. And the holiness requirement is explicit: Uzzah died for touching the Ark improperly (2 Samuel 6:6–7). If the container of stone tablets required such purity that contact with it was lethal, the living Ark — the vessel of God incarnate — would require an even more radical preservation from corruption. The IC is the theological consequence of the Ark typology that Luke himself constructed.
The New Eve — The Oldest Marian Typology in the Church. Justin Martyr (c. 155 AD) is the earliest documented source: “Eve, while a virgin and incorrupt, conceived the word of the serpent… but the Virgin Mary, taking faith and joy when Gabriel announced the good tidings…” (Dialogue with Trypho, 100). Irenaeus (c. 180 AD) develops it fully: “The knot of Eve’s disobedience was loosed by the obedience of Mary. For what the virgin Eve had bound fast through unbelief, this did the virgin Mary set free through faith” (Against Heresies III.22.4; V.19.1).
The typological logic is straightforward: if Mary is the New Eve, she must begin where Eve began — in a state of original grace, without sin. Eve was created sinless and fell. Mary was preserved sinless and remained faithful. The parallel requires the same starting point. Reformed Protestants accept Adam-Christ typology (Romans 5:12–19; 1 Corinthians 15:45) without objection. To accept Adam-Christ but reject Eve-Mary — when the latter has older patristic attestation — is ad hoc.
The Protoevangelium — Complete Enmity Requires Complete Purity. Genesis 3:15 is the first prophecy of redemption in all of Scripture: “I will put enmity between you and the woman, and between your offspring and her offspring; he shall bruise your head, and you shall bruise his heel.” The Fathers read the “woman” as Mary and her “offspring” as Christ. But notice what God says: he will put enmity — total, absolute opposition — between the serpent and the woman. If Mary ever bore original sin, even for an instant, the enmity was not total. She would have belonged, however briefly, to the domain of the serpent. The prophecy requires that the woman stand in complete opposition to Satan from the very first moment of her existence. Anything less and the enmity is partial, the opposition incomplete, and the prophecy overstated. The Immaculate Conception is what makes Genesis 3:15 literally true.
The Infinite Regress Objection — and Why It Fails. Grudem asks: if Mary needed to be sinless to bear Christ, why didn’t her mother need to be sinless? The answer is that the IC is not based on a general principle (“every mother of a holy person must be sinless”) but on a singular, unrepeatable act of God in preparing the vessel for the Incarnation. The Incarnation happened once. The preservation of the vessel for that Incarnation happened once. There is no regress because there is no repeating occasion. God made one Ark for the old covenant and did not require every box in Israel to be made of acacia and gold. He preserved one woman for the new covenant and did not need to preserve every woman in her lineage.
✗ Texts Cited Against the Immaculate Conception
“For all have sinned and fall short of the glory of God.”Romans 3:23
“My spirit rejoices in God my Savior.”Luke 1:47
“Sin came into the world through one man, and death through sin, and so death spread to all men because all sinned.”Romans 5:12
“If we say we have no sin, we deceive ourselves.”1 John 1:8
✓ Texts Supporting the Immaculate Conception
“Hail, κεχαριτωμένη, the Lord is with you.”
Luke 1:28Perfect passive participle: a completed, ongoing state of having been graced. Gabriel addresses Mary by her condition, not her name.
The power of the Most High will “overshadow” (
episkiasei) you.
Luke 1:35; cf. Exodus 40:35 LXXSame verb as the cloud overshadowing the Tabernacle. Mary is the new dwelling-place of God.
“Why is this granted to me, that the mother of my Lord should come to me?”
Luke 1:43; cf. 2 Samuel 6:9Elizabeth echoes David’s question about the Ark. Luke identifies Mary as the New Ark.
“I will put enmity between you and the woman, and between your offspring and her offspring.”
Genesis 3:15The Protoevangelium. The “woman” whose offspring will crush the serpent — read by the Fathers as Mary and Christ in complete opposition to Satan and sin.
“Make two cherubim of gold… on the two ends of the mercy seat.” Uzzah died for touching the Ark.
Exodus 25:18; 2 Samuel 6:6–7The Ark required radical holiness. The living Ark — carrying God himself — required even more.
Mary “arose and went into the hill country” — David “arose and went” to bring up the Ark. Mary stayed three months — the Ark stayed three months.
Luke 1:39, 56; 2 Samuel 6:2, 11Six distinct parallels in one chapter. Luke is constructing a typology, not recording coincidences.
The Ark of the Covenant appears in the heavenly temple — and immediately a “woman clothed with the sun” appears.
Revelation 11:19–12:1No chapter break in the original Greek. John sees the Ark — and then sees the Woman. The Ark is the Woman. Mary is the Ark in glory.
✦ The Fathers Speak
“With the exception of the holy Virgin Mary, in regard to whom, out of respect for the Lord, I do not propose to have a single question raised on the subject of sin — after all, how do we know what greater degree of grace for a complete victory over sin was conferred on her who merited to conceive and bring forth him whom all admit was without sin?”
St. Augustine · De Natura et Gratia 36.42, c. 415 AD · CSEL 60, pp. 263–264
“The knot of Eve’s disobedience was loosed by the obedience of Mary. For what the virgin Eve had bound fast through unbelief, this did the virgin Mary set free through faith.”
St. Irenaeus of Lyon · Against Heresies III.22.4; V.19.1, c. 180 AD · SC 211; ANF I:455
“You alone and your Mother are more beautiful than everything. There is no blemish on you, my Lord, and no spot on your Mother.”
St. Ephraim the Syrian · Carmina Nisibena 27:8, c. 370 AD · Bickell ed., pp. 122–123
“A virgin not only incorrupt, but a virgin whom grace has made inviolate, free from every stain of sin.”
St. Ambrose of Milan · Expositio Evangelii sec. Lucam II.17, c. 389 AD · CCSL 14
c. 155 AD
Justin Martyr — The New Eve
The earliest documented Eve/Mary typology. If Eve began without sin, the New Eve must begin the same way. Dialogue with Trypho, 100.
c. 180 AD
Irenaeus Develops the Typology
“The knot of Eve’s disobedience was loosed by the obedience of Mary.” Against Heresies III.22.4; V.19.1.
c. 370 AD
Ephraim the Syrian
“No blemish on you, my Lord, and no spot on your Mother.” An Eastern Father — Syriac, not Latin — affirming Mary’s purity.
c. 415 AD
Augustine Exempts Mary
In his definitive treatise on original sin, Augustine brackets Mary from the catalogue of sinners. De Natura et Gratia 36.42.
7th c.
Feast of Mary’s Conception
The Feast of the Conception of Mary originates in the monasteries of Palestine and spreads to the East.
1140
Bernard of Clairvaux Objects
Bernard opposes the feast on the grounds that Mary could not be sanctified before conception. He accepts her sinlessness but locates it after conception. Letter 174 to the Canons of Lyons.
c. 1307
Duns Scotus — Preservative Redemption
Scotus articulates the decisive theological breakthrough: Christ can save preservatively, not only remedially. Potuit, decuit, ergo fecit. The Franciscan Order champions the doctrine.
1546
Council of Trent Exempts Mary
Session V explicitly declares it “does not intend to include in this decree, which deals with original sin, the blessed and immaculate Virgin Mary, the Mother of God.”
1854
Ineffabilis Deus — Dogmatic Definition
Pius IX defines the Immaculate Conception as a doctrine “revealed by God and therefore to be believed firmly and constantly by all the faithful.” 546 of 603 bishops supported the definition.
1858
Lourdes — “I Am the Immaculate Conception”
Four years after the definition, the apparition at Lourdes identifies herself to Bernadette Soubirous in Gascon Occitan: “Que soy era Immaculada Councepciou.”
+“Isn’t the Immaculate Conception a late medieval invention? It wasn’t defined until 1854.”
The New Eve typology — which implies Mary’s sinless beginning — appears in Justin Martyr (c. 155 AD) and Irenaeus (c. 180 AD). Augustine exempted Mary from his catalogue of sinners in 415 AD. The Feast of Mary’s Conception was celebrated by the 7th century. The 1854 definition was the dogmatic capstone of a development running continuously from the 2nd century — exactly the pattern (sensus fidelium, liturgical practice, theological clarification, magisterial definition) that John Henry Newman described in his Essay on the Development of Christian Doctrine. Doctrinal definition is not doctrinal invention.
+“Even Thomas Aquinas and Bernard of Clairvaux opposed the Immaculate Conception!”
They did — but they opposed a specific formulation, not Mary’s sinlessness as such. Bernard accepted that Mary was sanctified in the womb but objected to placing that sanctification before conception. Aquinas held the same view (Summa III, q. 27, a. 2). Their objection was answered by Scotus’s distinction between remedial and preservative redemption, which neither Bernard nor Aquinas had available. The Church does not claim that every theologian in every century held the final formulation. It claims that the doctrine developed organically — and Scotus’s breakthrough resolved the difficulty that had troubled even the greatest minds.
+“Doesn’t ‘full of grace’ just mean ‘highly favored’?”
Protestant translations render kecharitomene as “highly favored” (NIV) or “favored one” (ESV), which obscure the Greek grammar. The word is a perfect passive participle — it describes an already-completed, enduring state of having been graced by God. Even the Protestant Greek scholar A. T. Robertson acknowledged it means “endowed with grace, enriched with grace,” and that the Vulgate’s gratiae plena (“full of grace”) is correct if understood as grace received. The KJV’s “highly favoured” is closer to the underlying state than modern dynamic renderings. The Catholic argument is not that this word alone proves the IC, but that it describes exactly the condition the IC teaches.
+“If Mary was sinless, why did she need a Savior? You can’t have it both ways.”
You can — and Scotus showed how. A person walking toward a pit can be saved by being pulled out (remedial) or by being caught before falling in (preservative). Both are genuine acts of salvation. The second is more perfect, not less. Mary was saved by Christ from the front: preserved from sin by his merits applied in advance. She needed a Savior and received the most excellent salvation possible. Ineffabilis Deus states: she was preserved “in view of the merits of Jesus Christ, Savior of the human race.” The IC does not deny Mary’s need for Christ. It magnifies Christ’s saving power by showing its most perfect expression.
+“The Orthodox reject the Immaculate Conception. So it’s not even a universal Christian teaching.”
The Orthodox affirm Mary as Panagia (“All-Holy”) and celebrate her complete purity. Their objection is not to Mary’s sinlessness but to the specific Western Augustinian doctrine of original sin that the IC presupposes. The Orthodox do not teach that Mary was stained by original sin — they deny the Latin framework within which the IC is formulated. This is a disagreement about the theology of original sin, not about Mary’s holiness. On the substance — that Mary was uniquely holy and free from sin — the Catholic and Orthodox traditions agree.
+“The Ark of the Covenant parallels are a stretch. Luke didn’t intend them.”
Six independent parallels in a single chapter are not coincidence. The verb anaphoneo in Luke 1:42 — Elizabeth “exclaimed with a loud cry” — appears nowhere else in the entire New Testament, and in the LXX it is used exclusively of Levitical exclamation before the Ark (1 Chronicles 15:28; 16:4–5). This is not the kind of detail apologetics invents; it is the kind it discovers. Even Protestant commentators who reject the Marian conclusion — I. Howard Marshall, Darrell Bock — acknowledge the deliberate Lucan allusions. A Protestant exegete must either accept the typology or argue that Luke wrote it without realizing what he was doing.
+“Doesn’t this make Mary equal to Christ? If she’s sinless, she’s basically divine.”
No — and the distinction is critical. Christ is sinless by nature. He is God, and God cannot sin. His impeccability is intrinsic to who he is. Mary is sinless by grace. She was preserved from sin not by her own power but by a singular act of God, applied in view of Christ’s merits. Her sinlessness is entirely dependent on her Son’s — it is a gift, not an attribute. The difference is the difference between the sun and the moon: the sun shines by its own light; the moon shines only by reflecting the sun. Mary’s holiness is reflected glory. It magnifies Christ rather than competing with him. This is precisely why Ineffabilis Deus insists Mary was preserved “in view of the merits of Jesus Christ” — every word of the definition points back to him.
✦ An Honest Concession
The Immaculate Conception is a fittingness argument — an argumentum convenientiae — not a strict deduction from a single proof-text. No verse says “Mary was conceived without original sin.” The IC was defined as a doctrine “revealed by God” through the convergence of Scripture, Tradition, the sensus fidelium, and magisterial reflection — not as an exegetical conclusion from one passage. The Catholic who claims otherwise overstates the case. The strength of the IC lies in the cumulative weight of Lucan typology, patristic witness, Scotist theology, and the organic development of doctrine — not in a single devastating proof-text.
Moreover, the fact that Bernard, Bonaventure, and Aquinas all had reservations is not something to hide. It is evidence that the Church takes her time, allows genuine theological debate, and does not define doctrines by fiat. The IC was defined only when the theological difficulties had been resolved, the liturgical consensus had been established, and the bishops of the world had been consulted. That process took centuries. That is not a weakness. It is how doctrine develops.
✦ The Verdict
The charge that the Immaculate Conception is unbiblical fails on every front. It fails exegetically — Romans 3:23 is a general statement about humanity’s condition, not an absolute that excludes all exceptions (as even Protestants concede for Christ). It fails typologically — Luke himself constructs Mary as the New Ark of the Covenant through six independent parallels in a single chapter, and the Ark typology demands radical holiness in the vessel of God. It fails patristically — Augustine, the greatest doctor of original sin, explicitly exempted Mary from his catalogue of sinners. It fails theologically — Scotus’s preservative redemption shows that the IC magnifies solus Christus rather than competing with it, because Mary’s preservation is the most perfect expression of Christ’s saving work.
The Protestant who worries that the IC elevates Mary above Christ has it backwards. The IC elevates Christ — by showing that his redemptive merit is so powerful it can save not only by healing wounds but by preventing them entirely. Potuit, decuit, ergo fecit. God could do it. It was fitting. Therefore he did it.
Works Cited
- Pitre, Brant. Jesus and the Jewish Roots of Mary: Unveiling the Mother of the Messiah. Image Books, 2018. Chs. 2–3.
- Hahn, Scott. Hail, Holy Queen: The Mother of God in the Word of God. Doubleday, 2001. Ch. 3.
- Sri, Edward. Queen Mother: A Biblical Theology of Mary’s Queenship. Emmaus Road, 2005.
- Scotus, John Duns. Ordinatio III, dist. 3, q. 1. Cf. Univ. of Dayton, International Marian Research Institute.
- Augustine. De Natura et Gratia 36.42. CSEL 60, ed. Urba/Zycha, 1913, pp. 263–264.
- Irenaeus. Against Heresies III.22.4; V.19.1. SC 211; ANF Vol. 1, p. 455.
- Ephraim the Syrian. Carmina Nisibena 27:8. Ed. Gustav Bickell (Brockhaus, 1866), pp. 122–123. Cf. Beck, CSCO 218–219.
- Ambrose. Expositio Evangelii secundum Lucam II.17. CCSL 14.
- Justin Martyr. Dialogue with Trypho 100. PG 6:709–712.
- Robertson, A. T. Word Pictures in the New Testament, Vol. II. Broadman, 1930, p. 13.
- Pius IX. Ineffabilis Deus. 8 December 1854.
- Luther, Martin. Festpostille sermon, 1527. WA 17/II, pp. 287–288. Note: passage disputed; removed in later editions.
- Calvin, John. Commentary on Luke 1:28. Calvini Opera, vol. 45. Trans. William Pringle.
- Grudem, Wayne. Systematic Theology. Zondervan, 1994, p. 531.
- Sproul, R. C. Are We Together? A Protestant Analyzes Roman Catholicism. Reformation Trust, 2012, ch. 6.
- Allison, Gregg. Roman Catholic Theology and Practice: An Evangelical Assessment. Crossway, 2014.
- White, James R. Mary—Another Redeemer? Bethany House, 1998.
- Pelikan, Jaroslav. Mary Through the Centuries. Yale University Press, 1996.