Taken from a very old, closed thread…
Quo Primum declares that the Latin Tridentine form of the Mass is THE ONLY version of the Catholic Mass in the West that may be used except for previous forms that were around in some traditions of the West 200 years before, etc. Here is an excerpt of what Pius V says:
“Let all everywhere adopt and observe what has been handed down by the Holy Roman Church, the Mother and Teacher of the other Churches, and let Masses not be sung or read according to any other formula than that of this Missal published by Us. This ordinance applies henceforth, now, and forever, throughout all the provinces of the Christian world”, exceptions were allowed from the start…By this present Constitution, which will be valid henceforth, now, and forever, We order and enjoin that nothing must be added to Our recently published Missal, nothing omitted from it, nor anything whatsoever be changed within it…No one whosoever is permitted to alter this notice of Our permission, statute, ordinance, command, precept, grant, indult, declaration, will, decree, and prohibition. Should anyone dare to contravene it, let him know that he will incur the wrath of Almighty God and of the Blessed Apostles Peter and Paul."
Now, of course the Novus Ordo completely went against this. Some will say that this Pope was not speaking infallibly in this Papal Bull. However, Isnt what the Pope says on matters of faith and morals binding ???
Who here would say that the Mass is not a matter of the faith ?