Pope Francis recently spoke to Jesuits in Hungary during his April 2023 trip about why he implemented the motu propio Traditionis Custodes.
He said that the rites were "being used in an ideological way." He told the 32 Jesuits, “After all the necessary consultations, I decided this because I saw that the good pastoral measures put in place by John Paul II and Benedict XVI were being used in an ideological way, to go backward. It was necessary to stop this ‘indietrismo,’ which was not in the pastoral vision of my predecessors." Moreover, he described the movement to keep the extraordinary form as a "nostalgic disease." Here are his full comments:
"I wouldn’t know how to answer that theoretically, but I certainly know that the Council is still being applied. It takes a century for a Council to be assimilated, they say. And I know the resistance to its decrees is terrible. There is unbelievable restorationism, what I call “indietrismo” (backwardness), as the Letter to the Hebrews (10:39) says: “But we do not belong to those who shrink back.” The flow of history and grace goes from the roots upward like the sap of a tree that bears fruit. But without this flow you remain a mummy. Going backwards does not preserve life, ever. You must change, as St. Vincent of Lérins wrote in his Commonitory when he remarked that even the dogma of the Christian religion progresses, consolidating over the years, developing with time, deepening with age. But this is a change from the bottom up. The danger today is indietrismo, the reaction against the modern. It is a nostalgic disease. This is why I decided that now the permission to celebrate according to the Roman Missal of 1962 is mandatory for all newly consecrated priests. After all the necessary consultations, I decided this because I saw that the good pastoral measures put in place by John Paul II and Benedict XVI were being used in an ideological way, to go backward. It was necessary to stop this indietrismo, which was not in the pastoral vision of my predecessors." - Pope Francis' comments to Jesuits in Hungary, 2023
As many of you may know, from the Council of Trent until a bit after Vatican II, the Mass was said mostly in Latin around the world and was structured a bit differently than the rite we have now. The priest did not face the people, there was no concelebration, Holy Communion was only given on the tongue and there were several Scriptural readings. Women were also not allowed on the altar as servers, extraordinary ministers of the Eucharist, or lectors. In fact, no lay person was allowed other than young altar boys. There was a deacon and sub-deacon. The rite was more introverted from the priest's standpoint.
After 1969, a simpler rite was promulgated by Saint Pope Paul VI. This rite was not a "new Mass" as some online and in so-called "traditionalist" circles claim. Paul VI made it clear in an Address to a General Audience, on November 19, 1969 (see: https://www.ewtn.com/catholicism/library/mass-is-the-same-8968). Furthermore, in another statement to Italian bishops, he said in Italian that the changes were part of a "new rite' (see: https://www.vatican.va/content/paul-vi/la/speeches/1976/documents/hf_p-vi_spe_19760524_concistoro.html). These words were mistranslated into "Novus Ordo" by some looking to push conspiracy theories claiming the Church was taken over by some mysterious group pushing for the "New World Order." Some even claim Paul VI was replaced by an imposter.
As Paul VI explains, the Mass is the same Mass. In other words, the Ordinary Form of the Mass we use today, and the Extraordinary Form are the one and same Mass of all ages. Certain rites that were redundant were removed and a few things were restored from the Mass of the Early Christians which we can read a description of in St. Justin Martyr's Apologia. The terms "Extraordinary Form" and "Ordinary Form" are the only proper ways to describe the rites and were formalized in Benedict XVI's Apostolic Letter given as a motu propio, Summorum Pontificum.
Paul VI described everything as "new," and was not referring to the Mass directly. By "new." he meant that the rites are being presented in a different fashion, not that they are innovations or something the Church made up along the way. Some claim Archbishop Bugnini "designed the Mass" and even wrote the second Eucharistic prayer on a napkin. These claims are all unfounded and are circulated around in order to give credence to the so-called "traditionalist" rhetoric. Some have even lied claiming Bugnini said that Mass was supposed to be Protestant in order to appease them or that it was even designed by Protestants. There is even a photo of several Protestant ministers which is often used as a meme to present the idea that Protestants helped design the Mass. This is again false. Protestants were at Vatican II as guests. They had no say in the council. In fact, the Council of Trent had Protestants as observers as well. The term "Novus Ordo" is a pejorative term used in an attempt to devalue the Ordinary Form of the Mass.

The fact is that the Church can change rites. She cannot change dogmas or doctrines and must not discard older rites for the sake of modernity. We read in Mediator Dei, an encyclical of Pius XII who as a pre-Vatican II pontiff the following:
58. It follows from this that the Sovereign Pontiff alone enjoys the right to recognize and establish any practice touching the worship of God, to introduce and approve new rites, as also to modify those he judges to require modification.[50] Bishops, for their part, have the right and duty carefully to watch over the exact observance of the prescriptions of the sacred canons respecting divine worship.[51] Private individuals, therefore, even though they be clerics, may not be left to decide for themselves in these holy and venerable matters, involving as they do the religious life of Christian society along with the exercise of the priesthood of Jesus Christ and worship of God; concerned as they are with the honor due to the Blessed Trinity, the Word Incarnate and His august mother and the other saints, and with the salvation of souls as well. For the same reason no private person has any authority to regulate external practices of this kind, which are intimately bound up with Church discipline and with the order, unity and concord of the Mystical Body and frequently even with the integrity of Catholic faith itself.
59. The Church is without question a living organism, and as an organism, in respect of the sacred liturgy also, she grows, matures, develops, adapts and accommodates herself to temporal needs and circumstances, provided only that the integrity of her doctrine be safeguarded. This notwithstanding, the temerity and daring of those who introduce novel liturgical practices, or call for the revival of obsolete rites out of harmony with prevailing laws and rubrics, deserve severe reproof. It has pained Us grievously to note, Venerable Brethren, that such innovations are actually being introduced, not merely in minor details but in matters of major importance as well. We instance, in point of fact, those who make use of the vernacular in the celebration of the august eucharistic sacrifice; those who transfer certain feast-days - which have been appointed and established after mature deliberation - to other dates; those, finally, who delete from the prayerbooks approved for public use the sacred texts of the Old Testament, deeming them little suited and inopportune for modern times.
60. The use of the Latin language, customary in a considerable portion of the Church, is a manifest and beautiful sign of unity, as well as an effective antidote for any corruption of doctrinal truth. In spite of this, the use of the mother tongue in connection with several of the rites may be of much advantage to the people. But the Apostolic See alone is empowered to grant this permission. It is forbidden, therefore, to take any action whatever of this nature without having requested and obtained such consent, since the sacred liturgy, as We have said, is entirely subject to the discretion and approval of the Holy See.
61. The same reasoning holds in the case of some persons who are bent on the restoration of all the ancient rites and ceremonies indiscriminately. The liturgy of the early ages is most certainly worthy of all veneration. But ancient usage must not be esteemed more suitable and proper, either in its own right or in its significance for later times and new situations, on the simple ground that it carries the savor and aroma of antiquity. The more recent liturgical rites likewise deserve reverence and respect. They, too, owe their inspiration to the Holy Spirit, who assists the Church in every age even to the consummation of the world.[52] They are equally the resources used by the majestic Spouse of Jesus Christ to promote and procure the sanctity of man.
-https://www.vatican.va/content/pius-xii/en/encyclicals/documents/hf_p-xii_enc_20111947_mediator-dei.html
So we read here how even before Vatican II there was an issue with the rites and people attempting to discard them with even older rites or introduce newer ones. Ideology was being pushed here. Pius XII was aware of it and Francis now is attempting to address it by restricting the use of the Extraordinary Form to only those whom Rome has given permission to. The problem is not the rites or the Mass, but the people in the Church who have an agenda. Pope Francis had to issue Traditionis Custodes in order to protect the Extraordinary Form from ideologies and other nonsense from people within the Church looking to push an agenda and cause division.
So-called traditionalists upset with the Motu Proprio Traditionis Custodes brought it upon themselves. They had it easy with Summorum Pontificum, yet continued to attack Vatican II, the Ordinary Form, and push false narratives regarding the "true church" vs modernists. Had they left well enough alone, Pope Francis would not have had to issue this new Motu Propio. The pope and bishops saw that those requesting the 1962 Missal just wanted to use it to push a false narrative and agenda. They did not want the rite for spiritual growth purposes. They also kept pushing false narratives that the Ordinary Form is an innovation, was created by Protestants, and is part of the new world order. As stated, some even pushed the idea that Paul VI had a doppelganger.
They completely ignored history and the facts of how the liturgy has developed since the first century. The 1962 Missal itself is a product of centuries of revisions. There is no "traditional Latin mass." It has constantly been evolving. There is no "Mass of the ages." These are coined terms meant to push a narrative that is not based on reality, history, and facts. Whether extraordinary or ordinary, the Mass is ONE and the same based on two hinges: the Word of God and the Eucharist. If a Catholic cannot see this or understand this, then he or she is worshiping rituals, not God Himself. This is why the pope did not repress the rite, but restricted its use showing he is protecting a treasure that is being abused by some fanatics for political reasons. Pius XII called the Church and Liturgy a "living organism" that grows and adapts, develops, and accommodates to the current situation. This does not mean the Mass rites of before Trent, the Mass rites before Vatican II are obsolete, or that the Mass rites after Vatican II are modernism or innovations. They are all part of the One and Same Mass and are valid, but applied appropriately depending on time, circumstances, and the needs of the people's spiritual lives.
I serve both forms and love them. This is because Christ is present in both, not because of the rituals themselves. They are man-made pomp and circumstances, so to speak. The vestments, rubric words, incense, and bells are all smoke and mirrors. What matters is the Word and Eucharist.
Hopefully, now, there will be respect for the Extraordinary Form and the Ordinary Form, as well as Vatican II and reality. Traditionis Custodes is tough love by the pontiff. He is the custodian and guardian of the faith and liturgy. We cannot have bad actors hijack this rite for ideology. Just search for those who call the pope "Bergoglio" or claim Vatican II is modernism. There are many out there using social media to promote this nonsense. They are to blame for the restrictions. Pope Francis is not an enemy of tradition or the Extraordinary Form. He is safeguarding it from wolves looking to tear it apart with their ideological nonsense.
He wrote:
Rome, 16 July 2021
Dear Brothers in the Episcopate,
Just as my Predecessor Benedict XVI did with Summorum Pontificum, I wish to accompany the Motu proprio Traditionis custodes with a letter explaining the motives that prompted my decision. I turn to you with trust and parresia, in the name of that shared “solicitude for the whole Church, that contributes supremely to the good of the Universal Church” as Vatican Council II reminds us.[1]
Most people understand the motives that prompted St. John Paul II and Benedict XVI to allow the use of the Roman Missal, promulgated by St. Pius V and edited by St. John XXIII in 1962, for the Eucharistic Sacrifice. The faculty — granted by the indult of the Congregation for Divine Worship in 1984[2] and confirmed by St. John Paul II in the Motu Proprio Ecclesia Dei in 1988[3] — was above all motivated by the desire to foster the healing of the schism with the movement of Mons. Lefebvre. With the ecclesial intention of restoring the unity of the Church, the Bishops were thus asked to accept with generosity the “just aspirations” of the faithful who requested the use of that Missal.
Many in the Church came to regard this faculty as an opportunity to adopt freely the Roman Missal promulgated by St. Pius V and use it in a manner parallel to the Roman Missal promulgated by St. Paul VI. In order to regulate this situation at the distance of many years, Benedict XVI intervened to address this state of affairs in the Church. Many priests and communities had “used with gratitude the possibility offered by the Motu proprio” of St. John Paul II. Underscoring that this development was not foreseeable in 1988, the Motu proprio Summorum Pontificum of 2007 intended to introduce “a clearer juridical regulation” in this area.[4] In order to allow access to those, including young people, who when “they discover this liturgical form, feel attracted to it and find in it a form, particularly suited to them, to encounter the mystery of the most holy Eucharist”,[5] Benedict XVI declared “the Missal promulgated by St. Pius V and newly edited by Blessed John XXIII, as a extraordinary expression of the same lex orandi”, granting a “more ample possibility for the use of the 1962 Missal”.[6]
In making their decision they were confident that such a provision would not place in doubt one of the key measures of Vatican Council II or minimize in this way its authority: the Motu proprio recognized that, in its own right, “the Missal promulgated by Paul VI is the ordinary expression of the lex orandi of the Catholic Church of the Latin rite”.[7] The recognition of the Missal promulgated by St. Pius V “as an extraordinary expression of the same lex orandi” did not in any way underrate the liturgical reform, but was decreed with the desire to acknowledge the “insistent prayers of these faithful,” allowing them “to celebrate the Sacrifice of the Mass according to the editio typica of the Roman Missal promulgated by Blessed John XXIII in 1962 and never abrogated, as the extraordinary form of the Liturgy of the Church”.[8] It comforted Benedict XVI in his discernment that many desired “to find the form of the sacred Liturgy dear to them,” “clearly accepted the binding character of Vatican Council II and were faithful to the Pope and to the Bishops”.[9] What is more, he declared to be unfounded the fear of division in parish communities, because “the two forms of the use of the Roman Rite would enrich one another”.[10] Thus, he invited the Bishops to set aside their doubts and fears, and to welcome the norms, “attentive that everything would proceed in peace and serenity,” with the promise that “it would be possible to find resolutions” in the event that “serious difficulties came to light” in the implementation of the norms “once the Motu proprio came into effect”.[11]
With the passage of thirteen years, I instructed the Congregation for the Doctrine of the Faith to circulate a questionnaire to the Bishops regarding the implementation of the Motu proprio Summorum Pontificum. The responses reveal a situation that preoccupies and saddens me, and persuades me of the need to intervene. Regrettably, the pastoral objective of my Predecessors, who had intended “to do everything possible to ensure that all those who truly possessed the desire for unity would find it possible to remain in this unity or to rediscover it anew”,[12] has often been seriously disregarded. An opportunity offered by St. John Paul II and, with even greater magnanimity, by Benedict XVI, intended to recover the unity of an ecclesial body with diverse liturgical sensibilities, was exploited to widen the gaps, reinforce the divergences, and encourage disagreements that injure the Church, block her path, and expose her to the peril of division.
At the same time, I am saddened by abuses in the celebration of the liturgy on all sides. In common with Benedict XVI, I deplore the fact that “in many places the prescriptions of the new Missal are not observed in celebration, but indeed come to be interpreted as an authorization for or even a requirement of creativity, which leads to almost unbearable distortions”.[13] But I am nonetheless saddened that the instrumental use of Missale Romanum of 1962 is often characterized by a rejection not only of the liturgical reform, but of the Vatican Council II itself, claiming, with unfounded and unsustainable assertions, that it betrayed the Tradition and the “true Church”. The path of the Church must be seen within the dynamic of Tradition “which originates from the Apostles and progresses in the Church with the assistance of the Holy Spirit” (DV 8). A recent stage of this dynamic was constituted by Vatican Council II where the Catholic episcopate came together to listen and to discern the path for the Church indicated by the Holy Spirit. To doubt the Council is to doubt the intentions of those very Fathers who exercised their collegial power in a solemn manner cum Petro et sub Petro in an ecumenical council,[14] and, in the final analysis, to doubt the Holy Spirit himself who guides the Church.
The objective of the modification of the permission granted by my Predecessors is highlighted by the Second Vatican Council itself. From the vota submitted by the Bishops there emerged a great insistence on the full, conscious and active participation of the whole People of God in the liturgy,[15] along lines already indicated by Pius XII in the encyclical Mediator Dei on the renewal of the liturgy.[16] The constitution Sacrosanctum Concilium confirmed this appeal, by seeking “the renewal and advancement of the liturgy”,[17] and by indicating the principles that should guide the reform.[18] In particular, it established that these principles concerned the Roman Rite, and other legitimate rites where applicable, and asked that “the rites be revised carefully in the light of sound tradition, and that they be given new vigor to meet present-day circumstances and needs”.[19] On the basis of these principles a reform of the liturgy was undertaken, with its highest expression in the Roman Missal, published in editio typica by St. Paul VI[20] and revised by St. John Paul II.[21] It must therefore be maintained that the Roman Rite, adapted many times over the course of the centuries according to the needs of the day, not only be preserved but renewed “in faithful observance of the Tradition”.[22] Whoever wishes to celebrate with devotion according to earlier forms of the liturgy can find in the reformed Roman Missal according to Vatican Council II all the elements of the Roman Rite, in particular the Roman Canon which constitutes one of its more distinctive elements.
A final reason for my decision is this: ever more plain in the words and attitudes of many is the close connection between the choice of celebrations according to the liturgical books prior to Vatican Council II and the rejection of the Church and her institutions in the name of what is called the “true Church.” One is dealing here with comportment that contradicts communion and nurtures the divisive tendency — “I belong to Paul; I belong instead to Apollo; I belong to Cephas; I belong to Christ” — against which the Apostle Paul so vigorously reacted.[23] In defense of the unity of the Body of Christ, I am constrained to revoke the faculty granted by my Predecessors. The distorted use that has been made of this faculty is contrary to the intentions that led to granting the freedom to celebrate the Mass with the Missale Romanum of 1962. Because “liturgical celebrations are not private actions, but celebrations of the Church, which is the sacrament of unity”,[24] they must be carried out in communion with the Church. Vatican Council II, while it reaffirmed the external bonds of incorporation in the Church — the profession of faith, the sacraments, of communion — affirmed with St. Augustine that to remain in the Church not only “with the body” but also “with the heart” is a condition for salvation.[25]
Dear brothers in the Episcopate, Sacrosanctum Concilium explained that the Church, the “sacrament of unity,” is such because it is “the holy People gathered and governed under the authority of the Bishops”.[26] Lumen gentium, while recalling that the Bishop of Rome is “the permanent and visible principle and foundation of the unity both of the bishops and of the multitude of the faithful,” states that you the Bishops are “the visible principle and foundation of the unity of your local Churches, in which and through which exists the one and only Catholic Church”.[27]
Responding to your requests, I take the firm decision to abrogate all the norms, instructions, permissions and customs that precede the present Motu proprio, and declare that the liturgical books promulgated by the saintly Pontiffs Paul VI and John Paul II, in conformity with the decrees of Vatican Council II, constitute the unique expression of the lex orandi of the Roman Rite. I take comfort in this decision from the fact that, after the Council of Trent, St. Pius V also abrogated all the rites that could not claim a proven antiquity, establishing for the whole Latin Church a single Missale Romanum. For four centuries this Missale Romanum, promulgated by St. Pius V was thus the principal expression of the lex orandi of the Roman Rite, and functioned to maintain the unity of the Church. Without denying the dignity and grandeur of this Rite, the Bishops gathered in ecumenical council asked that it be reformed; their intention was that “the faithful would not assist as strangers and silent spectators in the mystery of faith, but, with a full understanding of the rites and prayers, would participate in the sacred action consciously, piously, and actively”.[28] St. Paul VI, recalling that the work of adaptation of the Roman Missal had already been initiated by Pius XII, declared that the revision of the Roman Missal, carried out in the light of ancient liturgical sources, had the goal of permitting the Church to raise up, in the variety of languages, “a single and identical prayer,” that expressed her unity.[29] This unity I intend to re-establish throughout the Church of the Roman Rite.
Vatican Council II, when it described the catholicity of the People of God, recalled that “within the ecclesial communion” there exist the particular Churches which enjoy their proper traditions, without prejudice to the primacy of the Chair of Peter who presides over the universal communion of charity, guarantees the legitimate diversity and together ensures that the particular not only does not injure the universal but above all serves it”.[30] While, in the exercise of my ministry in service of unity, I take the decision to suspend the faculty granted by my Predecessors, I ask you to share with me this burden as a form of participation in the solicitude for the whole Church proper to the Bishops. In the Motu proprio I have desired to affirm that it is up to the Bishop, as moderator, promoter, and guardian of the liturgical life of the Church of which he is the principle of unity, to regulate the liturgical celebrations. It is up to you to authorize in your Churches, as local Ordinaries, the use of the Missale Romanum of 1962, applying the norms of the present Motu proprio. It is up to you to proceed in such a way as to return to a unitary form of celebration, and to determine case by case the reality of the groups which celebrate with this Missale Romanum.
Indications about how to proceed in your dioceses are chiefly dictated by two principles: on the one hand, to provide for the good of those who are rooted in the previous form of celebration and need to return in due time to the Roman Rite promulgated by Saints Paul VI and John Paul II, and, on the other hand, to discontinue the erection of new personal parishes tied more to the desire and wishes of individual priests than to the real need of the “holy People of God.” At the same time, I ask you to be vigilant in ensuring that every liturgy be celebrated with decorum and fidelity to the liturgical books promulgated after Vatican Council II, without the eccentricities that can easily degenerate into abuses. Seminarians and new priests should be formed in the faithful observance of the prescriptions of the Missal and liturgical books, in which is reflected the liturgical reform willed by Vatican Council II.
Upon you I invoke the Spirit of the risen Lord, that he may make you strong and firm in your service to the People of God entrusted to you by the Lord, so that your care and vigilance express communion even in the unity of one, single Rite, in which is preserved the great richness of the Roman liturgical tradition. I pray for you. You pray for me.
FRANCIS
__________________
[1] Cfr. Second Vatican Ecumenical Council, Dogmatic Constitution on the Church “Lumen Gentium”, 21 november 1964, n. 23 AAS 57 (1965) 27.
[2] Cfr. Congregation for Divine Worship, Letter to the Presidents of the Conferences of Bishops “Quattuor abhinc annos”, 3 october 1984: AAS 76 (1984) 1088-1089.
[3] John Paul II, Apostolic Letter given Motu proprio “Ecclesia Dei”, 2 july 1988: AAS 80 (1998) 1495-1498.
[4] Benedict XVI, Letter to the Bishops on the occasion of the publication of the Apostolic Letter “Motu proprio data” Summorum Pontificum on the use of the Roman Liturgy prior to the reform of 1970, 7 july 2007: AAS 99 (2007) 796.
[5] Benedict XVI, Letter to the Bishops on the occasion of the publication of the Apostolic Letter “Motu proprio data” Summorum Pontificum on the use of the Roman Liturgy prior to the reform of 1970, 7 july 2007: AAS 99 (2007) 796.
[6] Benedict XVI, Letter to the Bishops on the occasion of the publication of the Apostolic Letter “Motu proprio data” Summorum Pontificum on the use of the Roman Liturgy prior to the reform of 1970, 7 july 2007: AAS 99 (2007) 797.
[7] Benedict XVI, Apostolic Letter given Motu proprio “Summorum Pontificum”, 7 july 2007: AAS 99 (2007) 779.
[8] Benedict XVI, Apostolic Letter given Motu proprio “Summorum Pontificum”, 7 july 2007: AAS 99 (2007) 779.
[9] Benedict XVI, Letter to the Bishops on the occasion of the publication of the Apostolic Letter “Motu proprio data” Summorum Pontificum on the use of the Roman Liturgy prior to the reform of 1970, 7 july 2007: AAS 99 (2007) 796.
[10] Benedict XVI, Letter to the Bishops on the occasion of the publication of the Apostolic Letter “Motu proprio data” Summorum Pontificum on the use of the Roman Liturgy prior to the reform of 1970, 7 july 2007: AAS 99 (2007) 797.
[11] Benedict XVI, Letter to the Bishops on the occasion of the publication of the Apostolic Letter “Motu proprio data” Summorum Pontificum on the use of the Roman Liturgy prior to the reform of 1970, 7 july 2007: AAS 99 (2007) 798.
[12] Benedict XVI, Letter to the Bishops on the occasion of the publication of the Apostolic Letter “Motu proprio data” Summorum Pontificum on the use of the Roman Liturgy prior to the reform of 1970, 7 july 2007: AAS 99 (2007) 797-798.
[13] Benedict XVI, Letter to the Bishops on the occasion of the publication of the Apostolic Letter “Motu proprio data” Summorum Pontificum on the use of the Roman Liturgy prior to the reform of 1970, 7 july 2007: AAS 99 (2007) 796.
[14] Cfr. Second Vatican Ecumenical Council, Dogmatic Constitution on the Church “Lumen Gentium”, 21 november 1964, n. 23: AAS 57 (1965) 27.
[15] Cfr. Acta et Documenta Concilio Oecumenico Vaticano II apparando, Series I, Volumen II, 1960.
[16] Pius XII, Encyclical on the sacred liturgy “Mediator Dei”, 20 november 1947: AAS 39 (1949) 521-595.
[17] Cfr. Second Vatican Ecumenical Council, Costitution on the sacred liturgy “Sacrosanctum Concilium”, 4 december 1963, nn. 1, 14: AAS 56 (1964) 97.104.
[18] Cfr. Second Vatican Ecumenical Council, Costitution on the sacred liturgy “Sacrosanctum Concilium”, 4 december 1963, n. 3: AAS 56 (1964) 98.
[19] Cfr. Second Vatican Ecumenical Council, Costitution on the sacred liturgy “Sacrosanctum Concilium”, 4 december 1963, n. 4: AAS 56 (1964) 98.
[20] Missale Romanum ex decreto Sacrosancti Oecumenici Concilii Vaticani II instauratum auctoritate Pauli PP. VI promulgatum, editio typica, 1970.
[21] Missale Romanum ex decreto Sacrosancti Oecumenici Concilii Vaticani II instauratum auctoritate Pauli PP. VI promulgatum Ioannis Pauli PP. II cura recognitum, editio typica altera, 1975; editio typica tertia, 2002; (reimpressio emendata 2008).
[22] Cfr. Second Vatican Ecumenical Council, Costitution on the sacred liturgy “Sacrosanctum Concilium”, 4 december 1963, n. 3: AAS 56 (1964) 98.
[23] 1 Cor 1,12-13.
[24] Cfr. Second Vatican Ecumenical Council, Costitution on the sacred liturgy “Sacrosanctum Concilium”, 4 december 1963, n. 26: AAS 56 (1964) 107.
[25] Cfr. Second Vatican Ecumenical Council, Dogmatic Constitution on the Church “Lumen Gentium”, 21 november 1964, n. 14: AAS 57 (1965) 19.
[26] Cfr. Second Vatican Ecumenical Council, Costitution on the sacred liturgy “Sacrosanctum Concilium”, 4 december 1963, n. 6: AAS 56 (1964) 100.
[27] Cfr. Second Vatican Ecumenical Council, Dogmatic Constitution on the Church “Lumen Gentium”, 21 november 1964, n. 23: AAS 57 (1965) 27.
[28] Cfr. Second Vatican Ecumenical Council, Costitution on the sacred liturgy “Sacrosanctum Concilium”, 4 december 1963, n. 48: AAS 56 (1964) 113.
[29] Paul VI, Apostolic Constitution “Missale Romanum” on new Roman Missal, 3 april 1969, AAS 61 (1969) 222.
[30] Cfr. Second Vatican Ecumenical Council, Dogmatic Constitution on the Church “Lumen Gentium”, 21 november 1964, n. 13: AAS 57 (1965) 18.
Source: Lettera del Santo Padre Francesco ai Vescovi di tutto il mondo per presentare il Motu Proprio «Traditionis Custodes» sull’uso della Liturgia Romana anteriore alla Riforma del 1970
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Source:
https://www.catholicnewsagency.com/news/254268/pope-francis-says-traditional-latin-mass-was-being-used-in-an-ideological-way
https://www.vatican.va/content/pius-xii/en/encyclicals/documents/hf_p-xii_enc_20111947_mediator-dei.html
https://www.laciviltacattolica.com/this-is-gods-style-pope-francis-conversation-with-hungarian-jesuits/