Solemnity of the Immaculate Conception

"Our predecessors, indeed, by virtue of their apostolic authority, gloried in instituting the Feast of the Conception in the Roman Church. They did so to enhance its importance and dignity by a suitable Office and Mass, whereby the prerogative of the Virgin, her exception from the hereditary taint, was most distinctly affirmed. As to the homage already instituted, they spared no effort to promote and to extend it either by the granting of indulgences, or by allowing cities, provinces and kingdoms to choose as their patroness God's own Mother, under the title of "The Immaculate Conception." Again, our predecessors approved confraternities, congregations and religious communities founded in honor of the Immaculate Conception, monasteries, hospitals, altars, or churches; they praised persons who vowed to uphold with all their ability the doctrine of the Immaculate Conception of the Mother of God. Besides, it afforded the greatest joy to our predecessors to ordain that the Feast of the Conception should be celebrated in every church with the very same honor as the Feast of the Nativity; that it should be celebrated with an octave by the whole Church; that it should be reverently and generally observed as a holy day of obligation; and that a pontifical Capella should be held in our Liberian pontifical basilica on the day dedicated to the conception of the Virgin. Finally, in their desire to impress this doctrine of the Immaculate Conception of the Mother of God upon the hearts of the faithful, and to intensify the people's piety and enthusiasm for the homage and the veneration of the Virgin conceived without the stain of original sin, they delighted to grant, with the greatest pleasure, permission to proclaim the Immaculate Conception of the Virgin in the Litany of Loreto, and in the Preface of the Mass, so that the rule of prayer might thus serve to illustrate the rule of belief. Therefore, we ourselves, following the procedure of our predecessors, have not only approved and accepted what had already been established, but bearing in mind, moreover, the decree of Sixtus IV, have confirmed by our authority a proper Office in honor of the Immaculate Conception, and have with exceeding joy extended its use to the universal Church.

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To these praises they have added very noble words. Speaking of the conception of the Virgin, they testified that nature yielded to grace and, unable to go on, stood trembling. The Virgin Mother of God would not be conceived by Anna before grace would bear its fruits; it was proper that she be conceived as the first-born, by whom "the first-born of every creature" would be conceived. They testified, too, that the flesh of the Virgin, although derived from Adam, did not contract the stains of Adam, and that on this account the most Blessed Virgin was the tabernacle created by God himself and formed by the Holy Spirit, truly a work in royal purple, adorned and woven with gold, which that new Beseleel[26] made. They affirmed that the same Virgin is, and is deservedly, the first and especial work of God, escaping the fiery arrows the evil one; that she is beautiful by nature and entirely free from all stain; that at her Immaculate Conception she came into the world all radiant like the dawn. For it was certainly not fitting that this vessel of election should be wounded by the common injuries, since she, differing so much from the others, had only nature in common with them, not sin. In fact, it was quite fitting that, as the Only-Begotten has a Father in heaven, whom the Seraphim extol as thrice holy, so he should have a Mother on earth who would never be without the splendor of holiness.

This doctrine so filled the minds and souls of our ancestors in the faith that a singular and truly marvelous style of speech came into vogue among them. They have frequently addressed the Mother of God as immaculate, as immaculate in every respect; innocent, and verily most innocent; spotless, and entirely spotless; holy and removed from every stain of sin; all pure, all stainless, the very model of purity and innocence; more beautiful than beauty, more lovely than loveliness; more holy than holiness, singularly holy and most pure in soul and body; the one who surpassed all integrity and virginity; the only one who has become the dwelling place of all the graces of the most Holy Spirit. God alone excepted, Mary is more excellent than all, and by nature fair and beautiful, and more holy than the Cherubim and Seraphim. To praise her all the tongues of heaven and earth do not suffice.

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Therefore, having full trust in the Lord that the opportune time had come for defining the Immaculate Conception of the Blessed Virgin Mary, Mother of God, which Holy Scripture, venerable Tradition, the constant mind of the Church, the desire of Catholic bishops and the faithful, and the memorable Acts and Constitutions of our predecessors, wonderfully illustrate and proclaim, and having most diligently considered all things, as we poured forth to God ceaseless and fervent prayers, we concluded that we should no longer delay in decreeing and defining by our supreme authority the Immaculate Conception of the Blessed Virgin. And thus, we can satisfy the most holy desire of the Catholic world as well as our own devotion toward the most holy Virgin, and at the same time honor more and more the only begotten Son, Jesus Christ our Lord through his holy Mother -- since whatever honor and praise are bestowed on the Mother redound to the Son.
Wherefore, in humility and fasting, we unceasingly offered our private prayers as well as the public prayers of the Church to God the Father through his Son, that he would deign to direct and strengthen our mind by the power of the Holy Spirit. In like manner did we implore the help of the entire heavenly host as we ardently invoked the Paraclete. Accordingly, by the inspiration of the Holy Spirit, for the honor of the Holy and undivided Trinity, for the glory and adornment of the Virgin Mother of God, for the exaltation of the Catholic Faith, and for the furtherance of the Catholic religion, by the authority of Jesus Christ our Lord, of the Blessed Apostles Peter and Paul, and by our own:

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 Savior 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."

-- Ineffabilis Deus: Apostolic Constitution of Pope Pius IX on the Immaculate Conception (December 8, 1854)