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"Holy Thursday marks the institution of the priesthood and the Eucharist. What an incredible gift, and yet how very much it is ignored, or worse. Get to Confession, folks. Sorrowful Mysteries these three days. Blessed Triduum, all. -nvp"
Comments
In Article 38 it says: the Holy Spirit incorporated into the Church instituted in her the means of salvation through the bonds of "profession of faith, of the sacraments, of ecclesiastical government and of communion" through this structure which the document affirms to be visible, but "through the Supreme Pontiff and the Bishops."
Later, in Article 39, we can delve into this: the communion of the Church in the Eucharist is fundamental to communion with the Bishop and with the Roman Pontiff. The document condemns anyone who goes against this teaching because it is an "incongruity" to this unity. Because the Pope, as the successor of Peter, is "the perpetual and visible foundation of the unity not only of the Bishops, but also of the multitude of the faithful." And it becomes an "intrinsic requirement" to maintain a legitimate unity in the Catholic Church.
This Encyclical Letter shows us that the celebration of Mass is valid only when it expresses this communion with Peter, a legitimately elected Supreme Pontiff, and other legitimate Bishops in communion with him.