Church Teaching on the Mass:

"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, to all patriarchs, cathedral churches, collegiate and parish churches, be they secular or religious, both of men and of women - even of military orders - and of churches or chapels without a specific congregation in which conventual Masses are sung aloud in choir or read privately in accord with the rites and customs of the Roman Church. This Missal is to be used by all churches, even by those which in their authorization are made exempt, whether by Apostolic indult, custom, or privilege, or even if by oath or official confirmation of the Holy See, or have their rights and faculties guaranteed to them by any other manner whatsoever.
" Encyclical "Quo Primum" (Promulgating the Tridentine Liturgy) by Pope St. Pius V, 1570

"We specifically command each and every patriarch, administrator, and all other persons or whatever ecclesiastical dignity they may be, be they even cardinals of the Holy Roman Church, or possessed of any other rank or pre-eminence, and We order them in virtue of holy obedience to chant or to read the Mass according to the rite and manner and norm herewith laid down by Us and, hereafter, to discontinue and completely discard all other rubrics and rites of other missals, however ancient, which they have customarily followed; and they must not in celebrating Mass presume to introduce any ceremonies or recite any prayers other than those contained in this Missal.
" Encyclical "Quo Primum" (Promulgating the Tridentine Liturgy) by Pope St. Pius V, 1570

"CANON VI.--If any one saith, that the canon of the mass contains errors, and is therefore to be abrogated; let him be anathema."
Council of Trent, On the Sacrifice of the Mass

Church Teaching on the Missal Used at Mass:
"All other of the churches referred to above, however, are hereby denied the use of other missals, which are to be discontinued entirely and absolutely; whereas, 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 under the penalty of Our displeasure.
" Encyclical "Quo Primum" (Promulgating the Tridentine Liturgy) by Pope St. Pius V, 1570

"Furthermore, by these presents [this law], in virtue of Our Apostolic authority, We grant and concede in perpetuity that, for the chanting or reading of the Mass in any church whatsoever, this Missal is hereafter to be followed absolutely, without any scruple of conscience or fear of incurring any penalty, judgment, or censure, and may freely and lawfully be used. Nor are superiors, administrators, canons, chaplains, and other secular priests, or religious, of whatever title designated, obliged to celebrate the Mass otherwise than as enjoined by Us. We likewise declare and ordain that no one whosoever is forced or coerced to alter this Missal, and that this present document cannot be revoked or modified, but remain always valid and retain its full force notwithstanding the previous constitutions and decrees of the Holy See, as well as any general or special constitutions or edicts of provincial or synodal councils, and notwithstanding the practice and custom of the aforesaid churches, established by long and immemorial prescription - except, however, if more than two hundred years' standing.
" Encyclical "Quo Primum" (Promulgating the Tridentine Liturgy) by Pope St. Pius V, 1570

catholicessentials.net/themass.htm

Stand back, my friends! This evil house of cards will not long stand - it will collapse! The suppression of the True Mass will have consequences for the entire ontological reality of the Chicago area, which is already a cesspool of vice. The suppression of the True Mass will bring about even more blood in the streets. Furthermore, this so-called "bishop" will discover that the Lord will not be mocked - Cupich would be better off having a millstone tied around his neck and thrown into a cistern.

Here is just another Liturgical Scandal in Chicago from yesterday. At least, the priest is facing the people “to offer a concrete manifestation of the acceptance of the teaching of the Second Vatican Council and its liturgical books”:

youtube.com/watch?v=cuabYFzIzf8

Chicago’s St. John Cantius Church reacts to Archlayman Cupich’s implementation of Traditionis Custodes restricting the Traditional Latin Mass:

cantius.org/traditionescustodes