You're entitled to your opinion.
Since you've decided to join in, please elaborate on the quote from Pope Leo XIII. What is he saying in the quote below? What does he mean?
Why would anyone be banished from the Church by departing "from the doctrine propose by the authentic magisterium" if the authentic magisterium can err?
Bellator Dei,
“Elaboration” is very easy because Pope Leo XIII does it himself in the encyclical. The term “authentic magisterium” is more commonly translated, “authorized magisterium.” “Authorized” is a better translation because it is more descriptive of the meaning. The term only means that it is the pope himself who is engaging the magisterium
. It does not alone indicate what kind of magisterial power is being used. It could be the ‘authorized ordinary magisterium’ based upon his grace of state which is capable of error and has errored in the past. Or, it could also be the ‘authorized extra-ordinary Magisterium’ or the ‘authorized ordinary and universal Magisterium’ both of which engage the Church’s Attribute of Infallibility and from which error is impossible. Now the “authorized Magisterium” that Pope Leo is talking about in the encyclical is the Magisterium established by Jesus Christ that has the “authority” to engage the Attribute of Infallibility He gave His Church and that is clearly seen in the context of the encyclical.
It was consequently provided by God that the Magisterium instituted by Jesus Christ should not end with the life of the Apostles, but that it should be perpetuated. We see it in truth propagated, and, as it were, delivered from hand to hand. For the Apostles consecrated bishops, and each one appointed those who were to succeed them immediately "in the ministry of the word."
Pope Leo XIII, Satis Cognitum
The Magisterium is
“provided by God,” “instituted by Jesus Christ,” and
“delivered from hand to hand” to different churchmen throughout time who can engage the Magisterium.
So it is evident that without the “churchmen”, there is no access to the Magisterium. Consequently, those who say the “magisterium is their rule of faith” really mean “churchmen” are their rule of faith, i.e.: the pope is their rule of faith.
The practice of the Church has always been the same, as is shown by the unanimous teaching of the Fathers, who were wont to hold as outside Catholic communion, and alien to the Church, whoever would recede in the least degree from any point of doctrine proposed by her authoritative Magisterium. Epiphanius, Augustine, Theodoret, drew up a long list of the heresies of their times. St. Augustine notes that other heresies may spring up, to a single one of which, should any one give his assent, he is by the very fact cut off from Catholic unity. "No one who merely disbelieves in all (these heresies) can for that reason regard himself as a Catholic or call himself one. For there may be or may arise some other heresies, which are not set out in this work of ours, and, if any one holds to one single one of these he is not a Catholic" (S. Augustinus, De Haeresibus, n.).
Pope Leo XIII, Satis Cognitum
Here you see that the
“authorized Magisterium” is directly referring to condemned heresies, which only occurs with the overturning of Dogma. And Dogma is only possible by an infallible judgment of the Magisterium.
Wherefore, as appears from what has been said, Christ instituted in the Church a living, authoritative and permanent Magisterium, which by His own power He strengthened, by the Spirit of truth He taught, and by miracles confirmed. He willed and ordered, under the gravest penalties, that its teachings should be received as if they were His own. As often, therefore, as it is declared on the authority of this teaching that this or that is contained in the deposit of divine revelation, it must be believed by every one as true. If it could in any way be false, an evident contradiction follows; for then God Himself would be the author of error in man. "Lord, if we be in error, we are being deceived by Thee" (Richardus de S. Victore, De Trin., lib. i., cap. 2)………..
For this reason the Fathers of the Vatican Council laid down nothing new, but followed divine revelation and the acknowledged and invariable teaching of the Church as to the very nature of faith, when they decreed as follows: "All those things are to be believed by divine and Catholic faith which are contained in the written or unwritten word of God, and which are proposed by the Church as divinely revealed, either by a solemn definition or in the exercise of its ordinary and universal Magisterium" (Sess. iii., cap. 3). Hence, as it is clear that God absolutely willed that there should be unity in His Church, and as it is evident what kind of unity He willed, and by means of what principle He ordained that this unity should be maintained, we may address the following words of St. Augustine to all who have not deliberately closed their minds to the truth: "When we see the great help of God, such manifest progress and such abundant fruit, shall we hesitate to take refuge in the bosom of that Church, which, as is evident to all, possesses the supreme authority of the Apostolic See through the Episcopal succession? In vain do heretics rage round it; they are condemned partly by the judgment of the people themselves, partly by the weight of councils, partly by the splendid evidence of miracles. To refuse to the Church the primacy is most impious and above measure arrogant. And if all learning, no matter how easy and common it may be, in order to be fully understood requires a teacher and master, what can be greater evidence of pride and rashness than to be unwilling to learn about the books of the divine mysteries from the proper interpreter, and to wish to condemn them unknown?" (De Unitate Credendi, cap. xvii., n. 35).
Pope Leo XIII, Satis Cognitum
This confirms everything I have said. The Magisterium is “living” in that it is engaged by living people, i.e.: the pope. You can only have a pope if you have a papal office, i.e.: the form and the matter of the office cannot be destroyed as in sedeprivationism. It is “perpetual” in that there will always be successors to the papal office, i.e.: for sedevacantists to lose a pope for fifty years is not “perpetual” and what makes matters worse, they have means to ever get one.
And what confirms that the “authorized Magisterium” that Pope Leo is talking about the infallible Magisterium, he says, “As often, therefore, as it is declared on the authority of this teaching that this or that is contained in the deposit of divine revelation, it must be believed by every one as true.”Hope this helps.
Drew