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“But regarding the matter and form in the conferring of every order, by Our same supreme apostolic authority We decree and establish the following: … In the ordination of priests, the matter is the first imposition of the bishop’s hands which is done in silence… But the form consists of the words of the preface of which the following are essential and so required for validity:
“Grant, we beseech You, Almighty Father, to these Your servants, the dignity of the Priesthood (presbyterii dignitatem); renew the spirit of holiness within them, so that they may hold from You, O God, the office of the second rank in Your service and by the example of their behavior afford a pattern of holy living." (Pope Pius XII, Sacramentum Ordinis)
Theres no way around it. Pope Pius XII revealed as infallible truth that all those words are, in fact, required for validity. If you say that a word among those is meaningless, then you are saying that an Ex Cathedra statement is wrong.
>every one knows that the Church has the power to change and abrogate what she herself has established
Pius XII was talking about the traditio instrumentorum only, wich was established by the Church. Revealed truth, as in an Ex Cathedra statement, was not estabilished by the Church, since it's truth in itself.
"Besides, every one knows that the Roman Church has always held as valid Ordinations conferred according to the Greek rite without the traditio instrumentorum; so that in the very Council of Florence, in which was effected the union of the Greeks with the Roman Church, the Greeks were not required to change their rite of Ordination or to add to it the traditio instrumentorum: and it was the will of the Church that in Rome itself the Greeks should be ordained according to their own rite. It follows that, even according to the mind of the Council of Florence itself, the traditio instrumentorum is not required for the substance and validity of this Sacrament by the will of Our Lord Jesus Christ Himself"
"The matter and form make up the external rite, which has its special significance and efficacy from the institution of Christ. The words are the more important element in the composition" (Catholic enciclopedia)
"…diabolical error, when it has artfully colored its lies, easily clothes itself in the likeness of truth while very brief additions or changes corrupt the meaning of expressions; and confession, which usually works salvation, sometimes, with a slight change, inches toward death.” (Pope Clement XIII)
"Hence, the devil has always endeavored to deprive die world of the Mass by means of the heretics, constituting them the precursors of antichrist, whose first efforts will be to abolish the holy sacrifice of the altar; and, in punishment of the sins of men, his efforts will, according to the prophet Daniel, be successful. "And strength was given him against the continual sacrifice because of sins" (Dan. viii. 12)" (St. Alphonsus Liguori)