The two times a Pope has spoken ex cathedra or from the chair of Peter are when the Immaculate Conception was declared under Pope Pius IX in 1854. This tenet of papal infallibility was solidified with the first Vatican Council in 1870. The second time occurred in 1950 under Pope Pius XII with the dogma explained in Munificentissimus Deus with the Assumption of Mary. The Eastern Orthodox Church defines this as the Dormition or the Falling Asleep of the Virgin Mary.
The teachings of Mary’s Assumption was an established teaching by the early church in the 600s.
Saint John of Damascene on The Dormition of Mary (Office of Readings from the Roman Breviary)
“It was fitting that the she, who had kept her virginity intact in childbirth, should keep her own body free from all corruption even after death. It was fitting that she, who had carried the Creator as a child at her breast, should dwell in the divine tabernacles. It was fitting that the spouse, whom the Father had taken to himself, should live in the divine mansions. It was fitting that she, who had seen her Son upon the cross and who had thereby received into her heart the sword of sorrow which she had escaped when giving birth to him, should look upon him as he sits with the Father, It was fitting that God’s Mother should possess what belongs to her Son, and that she should be honored by every creature as the Mother and as the handmaid of God” (Dormition of Mary [A.D. 697])
Such a miracle of Mary’s glorious Assumption reminds us of the Christian mystery of being raised from the dead. The heavenly birthday of Mary in which she is received into heaven both body and soul is one that we should all celebrate. Mary as the new Eve is a sign for us Christians that the fall from grace by our first parents Adam & Eve is not lost. Through Mary’s obedience to the divine will of the Father her gift of being full of grace is shone with no stain of sin upon her soul nor corruption of her earthly body. How can Mary not be assumed into heaven when she was chosen as the Theotokos or God bearer of our Lord Jesus the Christ?
Catechism of the Catholic Church
“Finally the Immaculate Virgin, preserved free from all stain of original sin, when the course of her earthly life was finished, was taken up body and soul into heavenly glory, and exalted by the Lord as Queen over all things, so that she might be the more fully conformed to her Son, the Lord of lords and conqueror of sin and death.” The Assumption of the Blessed Virgin is a singular participation in her Son’s Resurrection and an anticipation of the resurrection of other Christians: In giving birth you kept your virginity; in your Dormition you did not leave the world, O Mother of God, but were joined to the source of Life. You conceived the living God and, by your prayers, will deliver our souls from death. (Catechism of the Catholic Church, 966)
Excerpts from APOSTOLIC CONSTITUTION OF
POPE PIUS XII MUNIFICENTISSIMUS DEUS DEFINING THE DOGMA OF THE ASSUMPTION, November 1, 1950
4. That privilege has shone forth in new radiance since our predecessor of immortal memory, Pius IX, solemnly proclaimed the dogma of the loving Mother of God’s Immaculate Conception. These two privileges are most closely bound to one another. Christ overcame sin and death by his own death, and one who through Baptism has been born again in a supernatural way has conquered sin and death through the same Christ. Yet, according to the general rule, God does not will to grant to the just the full effect of the victory over death until the end of time has come. And so it is that the bodies of even the just are corrupted after death, and only on the last day will they be joined, each to its own glorious soul.
5. Now God has willed that the Blessed Virgin Mary should be exempted from this general rule. She, by an entirely unique privilege, completely overcame sin by her Immaculate Conception, and as a result she was not subject to the law of remaining in the corruption of the grave, and she did not have to wait until the end of time for the redemption of her body.
14. Christ’s faithful, through the teaching and the leadership of their pastors, have learned from the sacred books that the Virgin Mary, throughout the course of her earthly pilgrimage, led a life troubled by cares, hardships, and sorrows, and that, moreover, what the holy old man Simeon had foretold actually came to pass, that is, that a terribly sharp sword pierced her heart as she stood under the cross of her divine Son, our Redeemer. In the same way, it was not difficult for them to admit that the great Mother of God, like her only begotten Son, had actually passed from this life. But this in no way prevented them from believing and from professing openly that her sacred body had never been subject to the corruption of the tomb, and that the august tabernacle of the Divine Word had never been reduced to dust and ashes. Actually, enlightened by divine grace and moved by affection for her, God’s Mother and our own dearest Mother, they have contemplated in an ever clearer light the wonderful harmony and order of those privileges which the most provident God has lavished upon this loving associate of our Redeemer, privileges which reach such an exalted plane that, except for her, nothing created by God other than the human nature of Jesus Christ has ever reached this level.
15. The innumerable temples which have been dedicated to the Virgin Mary assumed into heaven clearly attest this faith. So do those sacred images, exposed therein for the veneration of the faithful, which bring this unique triumph of the Blessed Virgin before the eyes of all men. Moreover, cities, dioceses, and individual regions have been placed under the special patronage and guardianship of the Virgin Mother of God assumed into heaven. In the same way, religious institutes, with the approval of the Church, have been founded and have taken their name from this privilege. Nor can we pass over in silence the fact that in the Rosary of Mary, the recitation of which this Apostolic See so urgently recommends, there is one mystery proposed for pious meditation which, as all know, deals with the Blessed Virgin’s Assumption into heaven.
16. This belief of the sacred pastors and of Christ’s faithful is universally manifested still more splendidly by the fact that, since ancient times, there have been both in the East and in the West solemn liturgical offices commemorating this privilege. The holy Fathers and Doctors of the Church have never failed to draw enlightenment from this fact since, as everyone knows, the sacred liturgy, “because it is the profession, subject to the supreme teaching authority within the Church, of heavenly truths, can supply proofs and testimonies of no small value for deciding a particular point of Christian doctrine.”
17. In the liturgical books which deal with the feast either of the dormition or of the Assumption of the Blessed Virgin there are expressions that agree in testifying that, when the Virgin Mother of God passed from this earthly exile to heaven, what happened to her sacred body was, by the decree of divine Providence, in keeping with the dignity of the Mother of the Word Incarnate, and with the other privileges she had been accorded. Thus, to cite an illustrious example, this is set forth in that sacramentary which Adrian I, our predecessor of immortal memory, sent to the Emperor Charlemagne. These words are found in this volume: “Venerable to us, O Lord, is the festivity of this day on which the holy Mother of God suffered temporal death, but still could not be kept down by the bonds of death, who has begotten your Son our Lord incarnate from herself.”
18. What is here indicated in that sobriety characteristic of the Roman liturgy is presented more clearly and completely in other ancient liturgical books. To take one as an example, the Gallican sacramentary designates this privilege of Mary’s as “an ineffable mystery all the more worthy of praise as the Virgin’s Assumption is something unique among men.” And, in the Byzantine liturgy, not only is the Virgin Mary’s bodily Assumption connected time and time again with the dignity of the Mother of God, but also with the other privileges, and in particular with the virginal motherhood granted her by a singular decree of God’s Providence. “God, the King of the universe, has granted you favors that surpass nature. As he kept you a virgin in childbirth, thus he has kept your body incorrupt in the tomb and has glorified it by his divine act of transferring it from the tomb.”
19. The fact that the Apostolic See, which has inherited the function entrusted to the Prince of the Apostles, the function of confirming the brethren in the faith,(13) has by its own authority, made the celebration of this feast ever more solemn, has certainly and effectively moved the attentive minds of the faithful to appreciate always more completely the magnitude of the mystery it commemorates. So it was that the Feast of the Assumption was elevated from the rank which it had occupied from the beginning among the other Marian feasts to be classed among the more solemn celebrations of the entire liturgical cycle. And, when our predecessor St. Sergius I prescribed what is known as the litany, or the stational procession, to be held on four Marian feasts, he specified together the Feasts of the Nativity, the Annunciation, the Purification, and the Dormition of the Virgin Mary.(14) Again, St. Leo IV saw to it that the feast, which was already being celebrated under the title of the Assumption of the Blessed Mother of God, should be observed in even a more solemn way when he ordered a vigil to be held on the day before it and prescribed prayers to be recited after it until the octave day. When this had been done, he decided to take part himself in the celebration, in the midst of a great multitude of the faithful.(15) Moreover, the fact that a holy fast had been ordered from ancient times for the day prior to the feast is made very evident by what our predecessor St. Nicholas I testifies in treating of the principal fasts which “the Holy Roman Church has observed for a long time, and still observes.”
20. However, since the liturgy of the Church does not engender the Catholic faith, but rather springs from it, in such a way that the practices of the sacred worship proceed from the faith as the fruit comes from the tree, it follows that the holy Fathers and the great Doctors, in the homilies and sermons they gave the people on this feast day, did not draw their teaching from the feast itself as from a primary source, but rather they spoke of this doctrine as something already known and accepted by Christ’s faithful. They presented it more clearly. They offered more profound explanations of its meaning and nature, bringing out into sharper light the fact that this feast shows, not only that the dead body of the Blessed Virgin Mary remained incorrupt, but that she gained a triumph out of death, her heavenly glorification after the example of her only begotten Son, Jesus Christ-truths that the liturgical books had frequently touched upon concisely and briefly.
21. Thus St. John Damascene, an outstanding herald of this traditional truth, spoke out with powerful eloquence when he compared the bodily Assumption of the loving Mother of God with her other prerogatives and privileges. “It was fitting that she, who had kept her virginity intact in childbirth, should keep her own body free from all corruption even after death. It was fitting that she, who had carried the Creator as a child at her breast, should dwell in the divine tabernacles. It was fitting that the spouse, whom the Father had taken to himself, should live in the divine mansions. It was fitting that she, who had seen her Son upon the cross and who had thereby received into her heart the sword of sorrow which she had escaped in the act of giving birth to him, should look upon him as he sits with the Father. It was fitting that God’s Mother should possess what belongs to her Son, and that she should be honored by every creature as the Mother and as the handmaid of God.”
22. These words of St. John Damascene agree perfectly with what others have taught on this same subject. Statements no less clear and accurate are to be found in sermons delivered by Fathers of an earlier time or of the same period, particularly on the occasion of this feast. And so, to cite some other examples, St. Germanus of Constantinople considered the fact that the body of Mary, the virgin Mother of God, was incorrupt and had been taken up into heaven to be in keeping, not only with her divine motherhood, but also with the special holiness of her virginal body. “You are she who, as it is written, appears in beauty, and your virginal body is all holy, all chaste, entirely the dwelling place of God, so that it is henceforth completely exempt from dissolution into dust. Though still human, it is changed into the heavenly life of incorruptibility, truly living and glorious, undamaged and sharing in perfect life.”(18) And another very ancient writer asserts: “As the most glorious Mother of Christ, our Savior and God and the giver of life and immortality, has been endowed with life by him, she has received an eternal incorruptibility of the body together with him who has raised her up from the tomb and has taken her up to himself in a way known only to him.”
27. Moreover, the scholastic Doctors have recognized the Assumption of the Virgin Mother of God as something signified, not only in various figures of the Old Testament, but also in that woman clothed with the sun whom John the Apostle contemplated on the Island of Patmos.(24) Similarly they have given special attention to these words of the New Testament: “Hail, full of grace, the Lord is with you, blessed are you among women,”(25) since they saw, in the mystery of the Assumption, the fulfillment of that most perfect grace granted to the Blessed Virgin and the special blessing that countered the curse of Eve.
28. Thus, during the earliest period of scholastic theology, that most pious man, Amadeus, Bishop of Lausarme, held that the Virgin Mary’s flesh had remained incorrupt-for it is wrong to believe that her body has seen corruption-because it was really united again to her soul and, together with it, crowned with great glory in the heavenly courts. “For she was full of grace and blessed among women. She alone merited to conceive the true God of true God, whom as a virgin, she brought forth, to whom as a virgin she gave milk, fondling him in her lap, and in all things she waited upon him with loving care.”
29. Among the holy writers who at that time employed statements and various images and analogies of Sacred Scripture to Illustrate and to confirm the doctrine of the Assumption, which was piously believed, the Evangelical Doctor, St. Anthony of Padua, holds a special place. On the feast day of the Assumption, while explaining the prophet’s words: “I will glorify the place of my feet,”(27) he stated it as certain that the divine Redeemer had bedecked with supreme glory his most beloved Mother from whom he had received human flesh. He asserts that “you have here a clear statement that the Blessed Virgin has been assumed in her body, where was the place of the Lord’s feet. Hence it is that the holy Psalmist writes: ‘Arise, O Lord, into your resting place: you and the ark which you have sanctified.”‘ And he asserts that, just as Jesus Christ has risen from the death over which he triumphed and has ascended to the right hand of the Father, so likewise the ark of his sanctification “has risen up, since on this day the Virgin Mother has been taken up to her heavenly dwelling.”
30. When, during the Middle Ages, scholastic theology was especially flourishing, St. Albert the Great who, to establish this teaching, had gathered together many proofs from Sacred Scripture, from the statements of older writers, and finally from the liturgy and from what is known as theological reasoning, concluded in this way: “From these proofs and authorities and from many others, it is manifest that the most blessed Mother of God has been assumed above the choirs of angels. And this we believe in every way to be true.”(29) And, in a sermon which he delivered on the sacred day of the Blessed Virgin Mary’s annunciation, explained the words “Hail, full of grace”-words used by the angel who addressed her-the Universal Doctor, comparing the Blessed Virgin with Eve, stated clearly and incisively that she was exempted from the fourfold curse that had been laid upon Eve.
31. Following the footsteps of his distinguished teacher, the Angelic Doctor, despite the fact that he never dealt directly with this question, nevertheless, whenever he touched upon it, always held together with the Catholic Church, that Mary’s body had been assumed into heaven along with her soul.
32. Along with many others, the Seraphic Doctor held the same views. He considered it as entirely certain that, as God had preserved the most holy Virgin Mary from the violation of her virginal purity and integrity in conceiving and in childbirth, he would never have permitted her body to have been resolved into dust and ashes.(32) Explaining these words of Sacred Scripture: “Who is this that comes up from the desert, flowing with delights, leaning upon her beloved?”(33) and applying them in a kind of accommodated sense to the Blessed Virgin, he reasons thus: “From this we can see that she is there bodily…her blessedness would not have been complete unless she were there as a person. The soul is not a person, but the soul, joined to the body, is a person. It is manifest that she is there in soul and in body. Otherwise she would not possess her complete beatitude.
34. The above-mentioned teachings of the holy Fathers and of the Doctors have been in common use during more recent times. Gathering together the testimonies of the Christians of earlier days, St. Robert Bellarmine exclaimed: “And who, I ask, could believe that the ark of holiness, the dwelling place of the Word of God, the temple of the Holy Spirit, could be reduced to ruin? My soul is filled with horror at the thought that this virginal flesh which had begotten God, had brought him into the world, had nourished and carried him, could have been turned into ashes or given over to be food for worms.”
35. In like manner St. Francis de Sales, after asserting that it is wrong to doubt that Jesus Christ has himself observed, in the most perfect way, the divine commandment by which children are ordered to honor their parents, asks this question: “What son would not bring his mother back to life and would not bring her into paradise after her death if he could?”(38) And St. Alphonsus writes that “Jesus did not wish to have the body of Mary corrupted after death, since it would have redounded to his own dishonor to have her virginal flesh, from which he himself had assumed flesh, reduced to dust.”
39. We must remember especially that, since the second century, the Virgin Mary has been designated by the holy Fathers as the new Eve, who, although subject to the new Adam, is most intimately associated with him in that struggle against the infernal foe which, as foretold in the protoevangelium,(44) would finally result in that most complete victory over the sin and death which are always mentioned together in the writings of the Apostle of the Gentiles.(45) Consequently, just as the glorious resurrection of Christ was an essential part and the final sign of this victory, so that struggle which was common to the Blessed Virgin and her divine Son should be brought to a close by the glorification of her virginal body, for the same Apostle says: “When this mortal thing hath put on immortality, then shall come to pass the saying that is written: Death is swallowed up in victory.”
40. Hence the revered Mother of God, from all eternity joined in a hidden way with Jesus Christ in one and the same decree of predestination, immaculate in her conception, a most perfect virgin in her divine motherhood, the noble associate of the divine Redeemer who has won a complete triumph over sin and its consequences, finally obtained, as the supreme culmination of her privileges, that she should be preserved free from the corruption of the tomb and that, like her own Son, having overcome death, she might be taken up body and soul to the glory of heaven where, as Queen, she sits in splendor at the right hand of her Son, the immortal King of the Ages.
44. For which reason, after we have poured forth prayers of supplication again and again to God, and have invoked the light of the Spirit of Truth, for the glory of Almighty God who has lavished his special affection upon the Virgin Mary, for the honor of her Son, the immortal King of the Ages and the Victor over sin and death, for the increase of the glory of that same august Mother, and for the joy and exultation of the entire Church; by the authority of our Lord Jesus Christ, of the Blessed Apostles Peter and Paul, and by our own authority, we pronounce, declare, and define it to be a divinely revealed dogma: that the Immaculate Mother of God, the ever Virgin Mary, having completed the course of her earthly life, was assumed body and soul into heavenly glory.
From the Collect at today’s mass: Almighty ever-living God, who assumed the Immaculate Virgin Mary, the Mother of your Son, body and soul into heavenly glory, grant, we pray, that, always attentive to the things that are above, we may merit to be sharers of her glory. Through our Lord Jesus Christ, your Son, who lives and reigns with you in the unity of the Holy Spirit, God, for ever and ever.
StreetEvangelist 
