The Vatican II liturgical reform received a firm endorsement from Pope Leo XIV this week, with the pontiff describing the changes to the Mass as necessary rather than optional, and rooting them squarely within Catholic tradition rather than in opposition to it.

His remarks came at his weekly general audience inside St. Peter’s Basilica on August 26, and they land in the middle of a fight that has been building for months.

What the Pope Said

Leo has spent recent months working through the major documents of the Second Vatican Council in his catechesis. This week he turned to Sacrosanctum Concilium, the council’s constitution on the liturgy.

That document opened the way for Mass to be celebrated in local languages rather than Latin and permitted substantial changes to the structure of the Latin-rite liturgy.

Drawing on the council’s teaching and on writings by Pope Paul VI from his years as archbishop of Milan, Leo revisited the concern that had motivated the reform in the first place: the reality that ordinary Catholics attended Mass as silent spectators. That concern, he said, reflected a renewed appreciation of what the liturgy actually is.

His central assertion was direct. Participation by the faithful cannot be passive.

From that conviction, he explained, came the need to make biblical texts and prayers accessible to everyone present, and to simplify the order of celebration compared with the liturgical books then in use.

Six Decades of Argument

The reform has been contested since its promulgation in 1963, and the dispute has never fully settled.

Pope Benedict XVI eased restrictions on celebrating the pre-conciliar Latin Mass. Pope Francis reversed course in 2021, tightening them considerably through Traditionis Custodes.

Each decision inflamed one side and relieved the other, leaving the question permanently unresolved in practice.

The Schism That Reopened Everything

The debate returned to prominence this summer under dramatic circumstances.

Clergy of the Society of St. Pius X, an ultraconservative group that has described the reformed liturgy as evil and lacking the spiritual substance the faithful require, were excommunicated. It represents the most significant schism in the Catholic Church in recent memory.

Several prominent bishops used that moment to press for wider permission to celebrate the older form of the Mass.

The Vatican’s Answer

Those appeals have not moved the institution.

The head of the Vatican’s liturgy office has stated plainly that Leo will not repeal the 2021 restrictions imposed by Francis.

He went further in a document circulated among cardinals, arguing that the reformed liturgy should be the only form of the Mass in the Latin rite.

That position leaves little ambiguity about where official policy stands, whatever pressure comes from individual prelates.

A Concession on Abuses

Leo did not dismiss traditionalist complaints entirely.

He acknowledged that liturgical abuses occurred in parts of the church during the period following the council, and said unfortunately they still occur at times today.

His explanation placed responsibility not on the reform itself but on its distortion, describing cases where the principles behind the changes were pushed to extremes or simply misunderstood.

Properly grasping what the council actually taught, he argued, is what makes it possible to reject those abuses.

That framing matters. It separates the reform from its worst implementations, allowing criticism of specific practices without conceding the underlying project.

The Argument From Tradition

The most substantive part of Leo’s remarks addressed the claim that Vatican II broke with the past.

He insisted the reform is firmly rooted in the living tradition of the church, and built his case on the nature of liturgy itself.

Because the liturgy is a living thing, he said, it has undergone development and change across the centuries. The magisterium has repeatedly adapted its forms to the needs of different eras.

Seen that way, the council’s decision to revise the liturgical books becomes unremarkable. It was undertaken with full respect for inherited tradition, and precisely in order to make that tradition more accessible.

This is the crux of the disagreement. Traditionalists see a rupture. Leo describes continuity, with the council doing what previous eras had also done.

Why He Is Teaching on the Council

In January, Leo announced that the documents of the Second Vatican Council would be the subject of his first catechesis series as pope.

His stated reason was practical. Catholics need to know what the council actually taught in order to keep finding ways to implement its insights.

The choice was itself a signal. Devoting his opening series as pope to Vatican II indicates where he intends to anchor his pontificate, particularly at a moment when parts of the church are questioning the council’s legacy openly.

What Comes Next

Beginning next week, Leo turns to Gaudium et Spes, the council’s pastoral constitution addressing the church’s relationship with the modern world.

That document raises its own set of contested questions about how the church engages with contemporary society, and it will likely generate discussion of a different kind.

For now, the message on the liturgy appears settled from the top, even if the argument in parishes and among bishops shows no sign of ending.