The Dogma of the Immaculate Conception (1854)

On 8 December 1854, in St Peter's Basilica in Rome, Pope Pius IX proclaimed the dogmatic definition. The official Latin text states:

"Declaramus, pronuntiamus et definimus doctrinam, quae tenet beatissimam Virginem Mariam in primo instanti suae conceptionis fuisse, singulari omnipotentis Dei gratia et privilegio, intuitu meritorum Christi Iesu Salvatoris humani generis, ab omni originalis culpae labe praeservatam immunem, esse a Deo revelatam atque idcirco ab omnibus fidelibus firmiter constanterque credendam."

Official French translation:

"We declare, pronounce and define that the doctrine which holds that the most Blessed Virgin Mary, in the first instance of her conception, by a singular grace and privilege granted by Almighty God, in view of the merits of Jesus Christ, the Saviour of the human race, was preserved free from all stain of original sin, is a doctrine revealed by God and therefore to be believed firmly and constantly by all the faithful." — Pius IX, bull Ineffabilis Deus, 8 December 1854 (Denzinger §§ 2800-2804)^[2]

Five elements make up the definition:

1. In the first instant of her conception (in primo instanti suae conceptionis) — not afterwards, not during the pregnancy
2. By a singular grace of Almighty God — it is God's work, not a personal merit
3. In view of the merits of Christ (intuitu meritorum Christi) — Mary is redeemed, not exempted from redemption
4. Preserved free from every stain (ab omni originalis culpae labe praeservatam immunem) — preservation, not healing after the fact
5. A doctrine revealed by God — engaging pontifical infallibility

The classic Protestant objection can be formalised as follows (Lavagna, p. 366):

"1. If Mary had not inherited original sin, then she had no need of the redemptive sacrifice of the cross to be saved. 2. But Mary did need the redemptive sacrifice of the cross to be saved. 3. Therefore Mary also inherited original sin (from nos. 1 and 2)."

Scotus's answer: preventive redemption

The error lies hidden in the first premise. The Franciscan theologian Blessed John Duns Scotus (c. 1265-1308) effected, at the turn of the 13th and 14th centuries, the theological revolution that made the dogmatic definition possible five centuries later, through the concept of praeredemptio (preventive or anticipated redemption).

Scotus envisaged three possible cases — Mary might never have contracted original sin, might have contracted it for an instant and then been purified of it, or might have been sanctified only after a time — and then decided by his principle, which became the golden rule of Franciscan Mariology:

"Quod autem horum trium, quae ostensa sunt esse possibilia, factum sit, Deus novit, — sed si auctoritati Ecclesiae vel auctoritati Scripturae non repugnet, videtur probabile quod excellentius est attribuere Mariae." ("Which of these three possible cases came about, God knows; but if it contradicts neither the authority of the Church nor that of Scripture, it seems probable to attribute to Mary what is most excellent.") — Blessed John Duns Scotus, Ordinatio III, distinction 3, q. 1 (c. 1300-1308)^[3]

Scholastic posterity summed up the Scotist argument in three words that became famous:

"Decuit, potuit, ergo fecit." ("It was fitting, God could do it, therefore God did it.") — Formula of Eadmer of Canterbury (c. 1060-1124), taken up by the Franciscan school to sum up the theology of Duns Scotus^[4]

The argument proceeds in three steps: decuit — it was fitting for the Mother of God to be preserved from sin; potuit — God had the power to do it; fecit — He actually did it. This formula, handed down by the Franciscan apologists, was the decisive instrument that enabled Catholic Mariology to overcome the objections of Bernard and Thomas^[5].

The classic analogy is that of the pit, which Lavagna formulates clearly:

"Imagine original sin as a pit. If you fall into it, Christ, by his redemptive sacrifice, helps you out of it: he saves you. But there is another way to save a person. You need only prevent them from falling into the pit. Thus Christ had only to fill in the pit before Mary could fall into it. In both cases it is God who intervenes and who saves, but in a different way. Mary was indeed saved by Jesus; no one denies it. But more than that: she was saved in a still more eminent way than other human beings, since the latter were healed of an evil, while she was preserved from the evil itself." — Matthieu Lavagna, op. cit., p. 366-367^[6]

This is what Vatican II expressly affirms in Lumen Gentium 53: Mary was "redeemed in a more exalted fashion by reason of the merits of her Son"^[7]. Preservation is a higher form of redemption — not an exception placing her outside the grace of Christ.

The argument from fittingness — Frédéric Guillaud

The philosopher Frédéric Guillaud, in Catholix Reloaded (Cerf, 2015), formulates the argument of theological fittingness:

*"Mary should have been born a sinner, like everyone else, but by an anticipated application of the merits of her Son, she was preserved from sin. The moral disease [that original sin is] was not transmitted to her. Why? The old apologetics manuals used to say, with a certain casualness: 'Would you put beautiful flowers in an ugly vase, if you could put them in a beautiful vase?

No? Then all the more so did God not place his Son in the womb of a being damaged by sin.' This is what is called in theology 'reasons of fittingness': it was possible, it was fitting, therefore God did it."*

— Frédéric Guillaud, Catholix Reloaded, Cerf, Paris, 2015, p. 301^[8]

Luke 1:28 — the kecharitomene

The key verse is the Annunciation:

"The angel went to her and said: 'Hail, full of grace, the Lord is with you.'" — Luke 1:28 (Crampon Bible)

The Greek reads: "Chaire, kecharitomene, ho Kyrios meta sou".

Kecharitomene (kecharitomene) is a passive perfect participle of the verb charitoo ("to fill with grace"). Three philological features are decisive:

1. The Greek perfect denotes a past action whose effects persist in the present — Mary was "filled with grace" in the past, and this state still endures

The passive indicates that the action comes from God — Mary is "filled with grace by God" 3. The participle has an almost vocative value — it is Mary's angelic proper name, her personal designation

The Angel does not say "be filled with grace" (aorist imperative, a future action) but "full of grace" — Mary is already in a state of fullness of grace before the conception of Christ. This state of full and permanent grace is the theological foundation of the dogma^[9].

For comparison, Ephesians 1:6 uses the same verb charitoo but in the aorist (echaritosen) — a one-time action of God filling the baptised with grace. Mary is the only person in the New Testament designated by the perfect — a permanent state.

Genesis 3:15 — the Protoevangelium

"I will put enmity between you and the woman, between your offspring and hers; she shall crush your head, and you shall bruise her heel." — Genesis 3:15 (Vulgate: "ipsa conteret caput tuum")

The first prophetic verse of the Bible, the Protoevangelium, announces an absolute enmity between the woman and the serpent (the figure of sin). This enmity could not be total if Mary were, even for an instant, under the dominion of sin^[10].

Song of Songs 4:7 — Tota pulchra es

"Tota pulchra es, amica mea, et macula non est in te." ("You are wholly beautiful, my beloved, and there is no stain in you.") — Song of Songs 4:7 (Vulgate)^[11]

A central verse of Catholic Marian liturgy since the 12th century, set to music notably by Bruckner and Duruflé. The word "macula" (stain) is precisely the term taken up by Ineffabilis Deus ("ab omni originalis culpae labe praeservatam immunem").

Luke 1:41-42 — Elizabeth's blessing

"Elizabeth was filled with the Holy Spirit, and cried out in a loud voice: 'Blessed are you among women, and blessed is the fruit of your womb!'" — Luke 1:41-42

The formula "blessed among women" (eulogemene sy en gynaixin) denotes a unique and incomparable blessing among all women — beyond even Sarah, Rebekah and Rachel.

The most frequent biblical objection relies on:

"For all have sinned and fall short of the glory of God." — Romans 3:23

Lavagna shows that the "all" (Greek pantes) is not absolute:

"We may already note that this 'all' cannot include Jesus; it therefore does not designate all human beings without exception. Moreover, personal sins do not apply to every person. If we took Paul's sentence literally, understanding a personal 'all', we would have to conclude that babies are sinners from birth. But that is absurd: children commit no personal sins before the age of reason." — Matthieu Lavagna, op. cit., p. 368^[12]

The author adds in a note:

"All the inhabitants of the earth will worship it [the Beast], those whose names have not been written in the book of life of the Lamb slain from the foundation of the world' (Rev 13:7). Does this mean that 100% of the inhabitants of the earth will worship the Beast and that not one will remain faithful to God? Impossible! Christ promised that the gates of hell would not prevail against his Church (Mt 16:18) and that he would be with his apostles, that is with his Church, 'always, to the end of the age' (Mt 28:20)! So this is not an 'all' in the absolute sense." — Matthieu Lavagna, op. cit., p. 369, note 587^[13]

And exegetically:

"Here St Paul does not mean 'all' human beings in the sense of 'each and every one'. He means only to embrace the two communities, Jewish and Gentile. Indeed, confronted with the circumcised who thought themselves better than the Gentiles, St Paul explains to them that both groups have sinned, Jews as well as Gentiles." — Matthieu Lavagna, op. cit., p. 369^[14]

If Jesus is excluded from the pantes (by his divine nature), Mary can be excluded in an analogous way — by the anticipated merits of Christ and her theandric role as Mother of God.

Saint Irenaeus of Lyons — Adversus Haereses III, 22, 4 (c. 180)

The bishop of Lyons, disciple of Polycarp, formulates the Eve-Mary typology from which the doctrine of the Immaculate Conception will theologically flow:

"Eve, being disobedient, became the cause of death for herself and for the whole human race; Mary, obedient, became the cause of salvation for herself and for the whole human race. [...] As through a disobedient virgin humanity was struck down and fallen, it was saved through an obedient virgin." — Saint Irenaeus of Lyons, Adversus Haereses III, 22, 4 and V, 19, 1 (c. 180)^[15]

If Eve before sin was without stain, Mary the "new Eve" had to be so a fortiori, for her obedience had to be the exact reversal of Eve's disobedience — and this required, for the rigour of the parallel, the same initial state of holiness.

Saint Ephrem the Syrian (c. 306-373) — Marian hymns

The Eastern Doctor of the Church sings:

"You alone, Lord, and your Mother are in every way more beautiful; for there is no stain on you, nor any defilement in your Mother." — Saint Ephrem the Syrian, Carmina Nisibena 27 (c. 363)^[16]

This is one of the earliest explicit patristic affirmations of the total absence of defilement in Mary.

Saint Augustine — De natura et gratia 36, 42 (c. 415)

Saint Augustine, the most rigorous defender of the doctrine of original sin against Pelagius, nevertheless makes an explicit exception for Mary:

"Excepta itaque sancta virgine Maria, de qua propter honorem Domini nullam prorsus, cum de peccatis agitur, haberi volo quaestionem, propter quam quomodo ad superandum omni ex parte peccatum, plus illi gratiae collatum fuerit, scire possimus quae concipere ac parere meruit eum quem constat nullum habuisse peccatum." ("With the exception, then, of the holy Virgin Mary, concerning whom, out of respect for the Lord, I wish no question at all to be raised when sins are discussed. For she merited to conceive and bear him who, as is known, had no sin.") — Saint Augustine, De natura et gratia 36, 42 (c. 415)^[17]

This saying, quoted by Pius IX in Ineffabilis Deus, shows that as early as the 5th century the intuition of Mary's total immunity was firmly established.

Saint Ambrose of Milan and Saint John Damascene

Saint Ambrose (340-397) calls Mary “liber vitae” ("book of life") and describes her as “sine macula” ("without stain")^[18]. Saint John Damascene (c. 676-749) in his De fide orthodoxa IV, 14 affirms the radical and perpetual holiness of the Theotokos^[19].

Saint Bernard and his opposition (12th century)

Paradoxically, Saint Bernard of Clairvaux (1090-1153), the great singer of Mary (“De Maria numquam satis”, "of Mary never enough"), initially opposed the feast of the Immaculate Conception. In his letter 174 to the canons of Lyons (c. 1138-1140), he maintains that Mary was sanctified “in her mother's womb” (like Jeremiah or John the Baptist, after animation), not at the first instant of conception. His reluctance came from the Aristotelian embryology of his time, which placed the infusion of the soul at 40 or 90 days^[20].

Saint Thomas Aquinas: an ambiguous text

Saint Thomas Aquinas (1225-1274) inherited this same embryological constraint. In the Summa theologiae IIIa, q. 27, a. 2, he teaches that Mary was “sanctified in her mother's womb” — after the animation of the soul, hence several weeks after biological conception. Lavagna clarifies:

"It is a complex question. Saint Thomas obviously believed that Mary had never known sin, nor even sinful temptations throughout her life. But since, in his view, the soul is not infused at conception, it would have been absurd for Mary to have been purified of original sin at that moment, since her soul did not yet exist." — Matthieu Lavagna, op. cit., p. 369^[21]

Saint Thomas nevertheless explicitly affirms Mary's total purity from sin:

"One may find some creature so pure that nothing purer can be found among created things. Such was the purity of the Blessed Virgin, who was exempt from all original and actual sin." — Saint Thomas Aquinas, I Sent., dist. 44, q. 1, a. 3^[22]

Lavagna concludes:

"Saint Thomas therefore believed that Mary was preserved from original sin from the moment she began to exist, but he was simply mistaken about the moment of that existence. He did not think the soul was infused from conception, for lack of scientific knowledge at the time. It is therefore absurd for Protestant apologists to use Saint Thomas against Catholic doctrine, especially since they would not be prepared to endorse the Thomist position on this subject." — Matthieu Lavagna, op. cit., p. 370^[23]

The revolution of Duns Scotus

It is the Franciscan John Duns Scotus who, around 1300-1308, effected the turning point by rigorously distinguishing preventive redemption (Mary) from curative redemption (the other baptised). His formula answered the last Thomist objection, showing that immaculate preservation does not exempt Mary from universal redemption — it is on the contrary its most eminent fruit.

According to the tradition reported by the Franciscan chronicles, Duns Scotus is said to have publicly defended the thesis at the University of Paris around 1306-1307 during a solemn disputatio in which he formulated an implacable syllogism: “Si potuit Deus, decuit Deum, ergo fecit” ("If God could do it, it was fitting for God to do it, therefore He did it"). This defence earned him the posthumous nickname Doctor Marianus ("Marian Doctor")^[24]. Beatified by John Paul II on 20 March 1993, Duns Scotus was designated by John Paul II as the singer of the incarnate Word and defender of the Immaculate Conception (20 March 1993)^[25].

The road to the dogma opened step by step, starting from an Eastern liturgical feast, which gradually became universal, then taught as certain by the Fathers of Trent, and finally solemnly defined as an article of faith by Pius IX^[26].

Twenty-four years before the dogmatic definition, in Paris, on 27 November 1830, in the chapel of the Daughters of Charity at 140 rue du Bac, a 24-year-old novice, Saint Catherine Labouré (1806-1876), received an apparition of the Virgin standing on a globe, crushing the serpent's head. Around the image, in letters of gold, ran a semicircular inscription:

"O Mary conceived without sin, pray for us who have recourse to you." — Apparition of the Miraculous Medal, 27 November 1830, rue du Bac, Paris^[31]

Mary asked Catherine to have a medal struck bearing this invocation. The first striking took place on 30 June 1832 by the goldsmith Vachette, with the authorisation of Mgr de Quélen, Archbishop of Paris. According to Yves Chiron's inquiry: 10,000 copies in June 1832, 100,000 by the end of 1832, about 10 million in 1842; the total distributed since 1832 is commonly estimated at over one billion copies^[32]. Many healings and conversions are attached to it — hence the popular nickname “Miraculous Medal”.

The 1830 apparition directly uses the theological formula “conceived without sin” that Pius IX would solemnly define twenty-four years later. The pope himself mentioned this popular devotion, in the years preceding Ineffabilis Deus, as a sign of the “deep and universal faith” of the Catholic people in the Immaculate Conception^[33]. The incorrupt body of Catherine Labouré still rests in the chapel of the rue du Bac in Paris^[34].

Barely four years after the dogmatic definition, on 11 February 1858, at the grotto of Massabielle near Lourdes, a 14-year-old girl, Bernadette Soubirous (1844-1879), illiterate, daughter of ruined millers, saw “a little lady in white” appear. The apparitions followed one another 18 times until 16 July 1858.

25 March 1858 — revelation of the name

During the 16th apparition, on Thursday 25 March 1858 (feast of the Annunciation), Bernadette three times asked the question: “Will you tell me your name?” The first two times, the Lady smiled in silence. At the third request, she joined her hands, raised her eyes to heaven, and answered in Gascon-Bigourdan patois (Bernadette's mother tongue):

"Que soy era Immaculada Councepciou." ("I am the Immaculate Conception.") — Apparition of Lourdes, 25 March 1858, 16th apparition^[35]

Bernadette, wholly ignorant of theology and of the 1854 dogmatic definition, did not understand the meaning of these words. So as not to forget, she ran to the presbytery repeating “Immaculada Councepciou, Immaculada Councepciou” all along the way. Before Abbé Peyramale, the parish priest of Lourdes — who had demanded precisely this identification — she spoke the name. Stupefied, the priest understood at once:

• Bernadette is illiterate and could not have invented this technical theological formula
• The concept of the “Immaculate Conception” is inaccessible to a 14-year-old shepherdess in 1858
• 25 March (the Annunciation) is the liturgically most fitting day for this revelation

The apparition was canonically recognised by Mgr Bertrand-Sévère Laurence, Bishop of Tarbes, on 18 January 1862. Bernadette was beatified in 1925 and canonised on 8 December 1933 by Pius XI (the anniversary day of Ineffabilis Deus).

Lourdes adds nothing to the dogma and does not define it a second time: a recognised apparition enlightens faith, it never defines it. As Pius XII would write in Fulgens Corona (8 September 1953), the Virgin wished, “in a wondrous manner, as it were to confirm” (prodigiali modo quasi confirmare) the sentence already pronounced by Pius IX^[36].

The incorruptibility of Bernadette's body

Bernadette died at Nevers on 16 April 1879. During the canonical exhumations of 1909, 1919 and 1925, her body was found largely preserved — but not without alteration: in 1925, wax masks of the face and hands (Maison Pierre Imans, Paris) were applied because of the colouring of the skin, before the exposition of her remains in the glass shrine at the chapel of Saint-Gildard in Nevers, where they are still visible^[37].

Martin Luther — Mary full of grace

Contrary to a modern Protestant myth, Luther seems long to have maintained Mary's total purity. According to a quotation reported in Luther's Works (vol. 43, p. 40) and taken up by Lavagna (p. 370, note 592) after Horn — a passage not checked against the critical edition, presented here as a reported testimony and not as proof — Luther is said to have written:

"The grace of God fills her with all good and preserves her from all evil." — Quotation attributed to Martin Luther, reported by Luther's Works 43, p. 40^[38]

And in his Disputation on the Divinity and Humanity of Christ of 1540, still according to the Horn–Lavagna chain:

"Mary's flesh and blood were entirely purified, so that no sin remained." — Martin Luther, Disputation on the Divinity and Humanity of Christ, thesis X, 28 February 1540, after the English translation quoted by Horn then Lavagna^[39]

These second-hand testimonies place this purification at the conception of Christ — and not at that of Mary: they do not amount to a profession of the Immaculate Conception in the Catholic sense, a position from which Luther later moved away.

Zwingli, Bullinger, Wesley

Heinrich Bullinger (1504-1575), Zwingli's successor at Zurich, is quoted by Horn (p. 336) then Lavagna (p. 371) as speaking, in a sermon on Mary (Marienpredigt, 1539), of the “pure and immaculate Virgin Mary”^[40] — a reported testimony, not checked against the original. John Wesley (1703-1791), founder of Methodism, in his Letter to a Roman Catholic (18 July 1749), confesses that Mary “continued a pure and unspotted virgin”^[41] — a testimony of perpetual virginity, not of the Immaculate Conception in the strict sense.

The Protestant historian David F. Wright, quoted by Horn (p. 330) then Lavagna (p. 371, note 594) without direct consultation of the original, is said to observe in Mary in the Reformers:

"The reformers (Luther, Calvin, Zwingli, etc.) had almost universally accepted Marian virginity and were very reluctant openly to declare that Mary had sinned and needed a saviour." — David F. Wright, Mary in the Reformers (quoted by Trent Horn, op. cit., p. 330)^[42]

The Orthodox position — Panagia

The Orthodox Churches venerate Mary as Panagia ("All-Holy"), affirming her radical and perpetual sanctification. But they formally reject the term Immaculate Conception — not by denying Mary's holiness, but because they conceive original sin differently (in the East: inheritance of death and corruption, rather than imputation of guilt as in the Augustinian West). For Orthodoxy, Mary therefore had no need to be preserved from an inherited guilt. See Vladimir Lossky, Essai sur la théologie mystique de l'Église d'Orient (Cerf, 1944)^[43].

Saint John Henry Newman — Mary the new Eve

Saint John Henry Newman (1801-1890), the Anglican convert who became a Catholic cardinal, formulates the decisive argument in his Letter to the Rev. E. B. Pusey (1865) and Du culte de la sainte Vierge dans l'Église catholique (Téqui, 1908):

"Mary, having to cooperate in the redemption of the world, was she not to receive at least as many graces as the first woman [Eve]?" — Saint John Henry Newman, Du culte de la sainte Vierge dans l'Église catholique, Téqui, Paris, 1908, p. 108^[44]

If Eve before the Fall was without stain, Mary the “new Eve” had to be likewise — “for Mary's obedience had to be the exact opposite of Eve's disobedience”. This required, for the rigour of the salvific parallel, the same initial state of original holiness.

Brant Pitre — the immaculate Ark of the Covenant

The American biblical scholar Brant Pitre (Augustine Institute) develops in Jesus and the Jewish Roots of Mary: Unveiling the Mother of the Messiah (Image Books, 2018, ISBN 978-0-525-57273-4) the typology of the Ark of the Covenant as a prefiguration of the immaculate Mary:

• The Ark is built of incorruptible acacia wood overlaid with pure gold (Ex 25:10-11)
• It bears the Decalogue (the written Word), the manna (the Bread from heaven), Aaron's rod (the priesthood)
• Mary bears the incarnate Word, the living Eucharist, the Sovereign High Priest
• As the Ark had to be a pure and inviolable sanctuary, Mary had to be so a fortiori

Pitre shows the exact textual parallels between the Visitation (Lk 1:39-56) and David's transfer of the Ark (2 Samuel 6): Mary “hastens” to the hill country as David “hastens” to Baale-Judah; John the Baptist “leaps” in Elizabeth's womb as David “dances with all his might” before the Ark; Mary remains “three months” with Elizabeth as the Ark remained “three months” in the house of Obed-Edom^[45].

The theological role: the new Eve in the same freedom

Lavagna formulates the ultimate argument from fittingness:

"It was all the more fitting for Mary to be immaculate, since she bears the title of 'new Eve'. If God could create the first woman (Eve) without any sin, then He could do just as much for Mary. Indeed, for Mary's obedience to be the exact opposite of Eve's disobedience, both had to be in the same state of freedom." — Matthieu Lavagna, op. cit., p. 368^[46]

The great post-Tridentine Mariological doctors

Saint Alphonsus Liguori — The Glories of Mary (1750)

Saint Alphonsus Liguori (1696-1787), Doctor of the Church since 1871, is one of the greatest modern Mariological theologians. His work Le Glorie di Maria (The Glories of Mary), published in Naples in 1750, became the popular manual of Catholic Marian devotion. In chapter I of the First Discourse, he explicitly defends the Immaculate Conception, more than a century before the dogmatic definition:

"It was fitting for the eternal Father to render this beloved Daughter entirely exempt from Adam's sin, because He destined her to be the Mother of His only Son." — Saint Alphonsus Liguori, The Glories of Mary, first discourse, ch. 1, Naples, 1750^[47]

In it Alphonsus gathers the patristic testimonies in favour of the IC: Saint Anselm of Canterbury, Saint Bernardine of Siena, Saint Bonaventure, Saint Thomas of Villanova, Saint Peter Damian. His central argument: maximum fittingness — “Quod decuit, potuit Christus matri suae conferre” ("What it was fitting for Christ to grant His Mother, He was able to" — a formula dear to Saint Bernardine and taken up by Duns Scotus).

Saint Louis-Marie Grignion de Montfort — True Devotion (1712)

The Breton missionary Saint Louis-Marie Grignion de Montfort (1673-1716), canonised in 1947, writes in his Treatise on True Devotion to the Blessed Virgin (written c. 1712, published posthumously in 1842):

"God the Father made a gathering of all the waters which He called the sea; He made a gathering of all the graces which He called Mary. This great God has a most rich treasure or storehouse, in which He has shut up all that He has of beautiful, splendid, rare and precious, even His own Son: and this immense storehouse is none other than Mary, whom the saints call the Lord's treasure." — Saint Louis-Marie Grignion de Montfort, Treatise on True Devotion to the Blessed Virgin, no. 23, c. 1712^[48]

This spirituality of total consecration to Jesus through Mary would be adopted by John Paul II — “Totus tuus ego sum” — whose entire pontifical motto (“Totus tuus ego sum, et omnia mea tua sunt”) is taken from Montfort.

Saint Maximilian Kolbe — Knight of the Immaculata (1917-1941)

The Conventual Franciscan Saint Maximilian Mary Kolbe (1894-1941), martyr of Auschwitz on 14 August 1941 (eve of the Assumption), carried devotion to the Immaculata to a strong theological intuition. In his spiritual notes of February 1941, written a few months before his deportation, he meditated:

"The Immaculata is the most perfect expression of creation. She is, by grace, what the Holy Spirit is by nature: an Immaculate Conception." — Saint Maximilian Kolbe, spiritual notes, Niepokalanów, 17 February 1941^[49]

Kolbe founded in 1917 the Militia of the Immaculata (Militia Immaculatae), then in 1927 the City of the Immaculata (Niepokalanów) in Poland, which counted up to 762 friars in 1939 — the largest religious community in the Catholic world on the eve of the Second World War. His motto: “To bring all men, through the Immaculata, to Jesus.” Canonised by John Paul II on 10 October 1982^[50].

8 December is celebrated throughout the Latin Church as the Solemnity of the Immaculate Conception — a feast of precept (holy day of obligation) in many Catholic countries, notably the United States, Italy, Spain, Portugal, Austria and Argentina, but not everywhere (in France it is not a holy day of obligation)^[51]. The date falls nine months before 8 September (the Nativity of the Virgin). The liturgy has a proper Mass and a complete Office; the feast was formerly accompanied by an octave, suppressed by Pius XII's reform in 1955^[52].

The Immaculate Conception is honoured as patroness in many countries — notably the United States (Basilica of the National Shrine in Washington), Spain, Portugal, Brazil, Paraguay, Argentina, Nicaragua, the Philippines, Korea^[53] — and by many religious orders (Conventual Franciscans, Brothers of the Christian Schools, etc.).

• Mary's perpetual virginity — the second Marian dogma
• The divinity of Jesus — foundation of Mary's divine motherhood
• The Council of Trent — which excludes Mary from the universality of original sin
• Papal infallibility — which defined the dogma in 1854