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The document of Pope Pius V, Quo Primum, must be considered carefully from the point of view of doctrine. It is not an infallible decision, because infallibility, as we know, refers directly to the content of divine revelation. To issue a practical order, to say that you may use this or that you must not prohibit its use, is a practical decision. It is not directly a matter of divine revelation to prescribe a rite in itself.
The rite of the liturgy contains divine revealed truths, of course, but the practical aspects, to use or not to use, to punish or not to punish, belong to the pastoral and disciplinary sphere. In matters of discipline, we have no dogma of faith that the Pope is infallible. Infallibility concerns the content of divine revelation. Here we are speaking about a practical question, so we must distinguish this clearly.
In my opinion, the decision of Pope Pius V is not infallible, but it has very high authority. It is expressed in an exceptionally solemn manner and refers to the concrete rite. Because of this, I think that the Pope and his successors should not prohibit its use or declare invalid the decision of Pope Pius V, out of reverence for his predecessors and out of reverence for tradition and the principle of tradition.
It is an essential characteristic of the Petrine ministry of the Pope to hand on what he has received. This is the principle of the apostles, as Saint Paul said. If a Pope were to act in such an important matter as the celebration of the Mass and forbid a rite that was celebrated for centuries, in this case for more than a millennium, it would contradict the manner of acting of the Church throughout 2000 years. The Church never abrogated or forbade a rite that had been celebrated for centuries.
Such an action would be harmful and would damage the Church. It would be an evident abuse of power. If this were to occur, which we hope not, the situation would be similar to what happened after 1970, when Paul VI de facto forbade the celebration of the ancient rite. Priests then celebrated clandestinely and continued to do so. Some bishops and many faithful groups throughout the world began to ask the Holy See for permission to celebrate it again. As we know, in 1984, John Paul II granted the first permission again.
If this were to happen again, it would last only for a time. God would give His Church a Pope who would restore justice. This is also a question of fundamental justice and of the principle of tradition, which is an essential characteristic of the Roman Church. For 2000 years, with the exception of the last fifty years, the Roman Church was an example of faithfully keeping the traditions of the fathers in faith and also in discipline.
This will continue. It is a gift of God to the Roman See. Even if in our current time this characteristic of fidelity to tradition is partly obscured, it is still present in the Roman See, and it will continue until the end of time. Even if now it seems obscured, it will surely reappear again.