Arguments about the Mass of Paul VI, often called the Novus Ordo Missae, mix three different questions. The first is whether the rite is valid: whether the sacrament actually takes place. The second is whether it is licit and legitimate: lawfully approved and celebrated. The third is whether it is a good and adequate expression of the Catholic faith. Official texts answer the first two plainly. Most genuine debate concerns the third.
What trad media commonly claims
Sedevacantists: invalid. The fullest case is Work of Human Hands (2010) by Fr. Anthony Cekada, a 468-page critique arguing that the rite undermines Catholic teaching on the Real Presence (Wikipedia summary). A review on The Rad Trad blog summarises his argument that the words of institution function as a narrative rather than a consecratory formula, and notes that the conclusion is widespread among sedevacantists. Novus Ordo Watch goes further, calling the rite invalid in most vernacular translations, especially English (NOW). See sedevacantism.
The SSPX: valid in itself, but harmful. According to the Society of Saint Pius X, Archbishop Marcel Lefebvre refused to call the New Mass generally invalid or heretical, while warning that it "leads slowly to heresy" (sspx.org). A 2002 answer in The Angelus, published by the Society's Angelus Press, held that validity is judged, as for any sacrament, by "matter, form and intention", and that the rite's defective theology does "not necessarily invalidate the Mass" (The Angelus, archived). The Society's pastoral line is nonetheless severe: its guidance "Must Catholics attend the New Mass?" tells the faithful to avoid it. On the reformed rite of episcopal consecration, an SSPX study judged the reasons for suspecting its validity "not at all serious", while allowing for invalid ceremonies in particular cases (sspx.org). Critics such as the Daily Compass contend that the Society in practice treats the new rites as doubtful (Daily Compass).
Rhetoric beyond the SSPX. Writing in The Wanderer, Fr. Brian Harrison objected to Archbishop Carlo Maria Viganò's "increasingly exaggerated and unfair attacks on the reformed post-Vatican II liturgy" (The Wanderer). The 1969 "Ottaviani Intervention" (below), which the SSPX continues to publish (sspx.org), remains the most-cited document in these debates.
What the documents say
- Paul VI, Missale Romanum (1969). The apostolic constitution of 3 April 1969 promulgated the revised Missal as a revision of the Missal of Pius V, effective from Advent 1969 (vatican.va). In his general audience of 26 November 1969, Paul VI spoke openly of the novelty of the new rite and announced its introduction in Italy on 30 November (text).
- The criteria for validity. Catholic sacramental theology judges validity by matter, form, minister and intention. The Council of Trent taught that the Church may change how the sacraments are administered while preserving their substance (Session XXI, ch. 2), and defined the Mass as a true sacrifice (Session XXII). Both sides of the debate invoke these texts.
- Benedict XVI, Summorum Pontificum (2007). Article 1 called the Missal of Paul VI the ordinary, and the 1962 Missal the extraordinary, expression of the one lex orandi: "two usages of the one Roman rite" (vatican.va). The accompanying letter said that "What earlier generations held as sacred" remains sacred and cannot suddenly be forbidden. It also said that priests of communities using the older form "cannot, as a matter of principle, exclude celebrating according to the new books" (letter).
- Conditions for using the older Missal. Quattuor abhinc annos (1984), Universae Ecclesiae (2011, no. 19; vatican.va) and Traditionis custodes (2021, art. 3 §1) all required that those using the older Missal not deny the legitimacy or validity of the reformed rite. See liturgy law after Traditionis custodes.
- Francis, Traditionis custodes (2021), art. 1. The books promulgated by Paul VI and John Paul II are declared "the unique expression of the lex orandi of the Roman Rite" (vatican.va).
- 2026. The Holy See's treatment of the SSPX shows the distinction between validity and liceity at work. According to OSV News, the July 2026 documents treat SSPX Masses as valid but illicit, while U.S. bishops continue to urge Catholics not to attend (Catholic World Report). On 26 August 2026 Leo XIV told a general audience that the Council's liturgical reform had been "necessary" for fuller participation (NCR).
The historical and scholarly record
The Ottaviani Intervention. On 25 September 1969 Cardinals Alfredo Ottaviani and Antonio Bacci sent Paul VI a "Short Critical Study" prepared by a group of Roman theologians. It judged that the new Order of Mass represented "a striking departure from the Catholic theology of the Mass as it was formulated in Session 22 of the Council of Trent" (Fordham Sourcebook). It singled out article 7 of the 1969 General Instruction, which described the Mass as an assembly of the people of God; the 1970 edition of the Instruction revised some passages and added a foreword (overview).
The Lafond letter. A letter of 17 February 1970 over Ottaviani's signature, addressed to Dom Gérard Lafond and published in La Documentation catholique, said his doubts had been "put to rest" (Catholic Answers). Traditionalists dispute its authenticity. The French writer Jean Madiran suggested that the nearly blind cardinal signed it without knowing its contents (overview).
Critique without denial of validity. Much traditionalist scholarship criticises the content of the reform while accepting its validity. Cekada's book itself was praised by some mainstream reviewers, and a 2012 review in Antiphon called it a substantial attempt to show a theological rupture between the two missals (Wikipedia). Writing at Catholic Culture in 2021, Phil Lawler noted the Congregation for Divine Worship's concern that many traditionalists do not recognise the reformed rite's validity, and concluded that the Novus Ordo is valid. Catholic Answers argues that the SSPX's position would leave hundreds of millions of Catholics without a legitimate Mass.
Where reasonable Catholics disagree
- Quality, not validity. Catholics in full communion debate translations, how far the 1969–70 changes went beyond what Sacrosanctum Concilium asked, and how the two missals should coexist. An essay in Catholic World Report argued that noting the gap between the Council and the Missal does not reject the new Mass's legitimacy, even if it sees the reform as a loose interpretation of the Council's vision.
- Legitimacy. The SSPX accepts that the new rite can be valid but does not accept it as a good and legitimate rite. That refusal is exactly what Universae Ecclesiae and Traditionis custodes exclude for groups in communion. Communities such as the Priestly Fraternity of Saint Peter have accepted the condition: the Archdiocese of Denver's implementing decree found that FSSP priests do not deny the validity and legitimacy of the liturgical reform. See Ecclesia Dei communities.
- Particular celebrations. Any sacrament can fail in a given case through a defect of matter, form or intention, as the SSPX's own study allowed for episcopal consecrations. That is a different claim from saying the rite as such is invalid, which among the positions surveyed here only sedevacantist writers make.
Key sources
- Paul VI, Missale Romanum (1969); Benedict XVI, Summorum Pontificum art. 1 and letter to bishops (2007); Francis, Traditionis custodes arts. 1, 3 (2021)
- Ottaviani and Bacci, "Short Critical Study" (Fordham Sourcebook); Catholic Answers, "Is the New Mass Illegitimate?"
- SSPX, "What Archbishop Lefebvre said about the New Mass"; The Angelus (2002), Q&A on validity