6. In setting forth its instructions for the revision of the Order of Mass, the Second Vatican Council, using the same words as did Saint Pius V in the Apostolic Constitution Quo primum, by which the Missal of Trent was promulgated in 1570, also ordered, among other things, that some rites be restored "to the original norm of the holy Fathers."11 From the fact that the same words are used it can be seen how both Roman Missals, although separated by four centuries, embrace one and the same tradition. Furthermore, if the inner elements of this tradition are reflected upon, it also becomes clear how outstandingly and felicitously the older Roman Missal is brought to fulfillment in the new.
7. In a difficult period when the Catholic faith on the sacrificial nature of the Mass, the ministerial priesthood, and the real and permanent presence of Christ under the eucharistic species were placed at risk, Saint Pius V was especially concerned with preserving the more recent tradition then unjustly being assailed, introducing only very slight changes into the sacred rite. In fact, the Missal of 1570 differs very little from the very first printed edition of 1474, which in turn faithfully follows the Missal used at the time of Pope Innocent III. Moreover, even though manuscripts in the Vatican Library provided material for the emendation of some expressions, they by no means made it possible to inquire into "ancient and approved authors" farther back than the liturgical commentaries of the Middle Ages.
8. Today, on the other hand, countless learned studies have shed light on the "norm of the holy Fathers" which the revisers of the Missal of Saint Pius V followed. For following the publication first of the Sacramentary known as the Gregorian in 1571, critical editions of other ancient Roman and Ambrosian Sacramentaries were published, often in book form, as were ancient Hispanic and Gallican liturgical books which brought to light numerous prayers of no slight spiritual excellence that had previously been unknown.
In a similar fashion, traditions dating back to the first centuries, before the formation of the rites of East and West, are better known today because of the discovery of so many liturgical documents.
Moreover, continuing progress in the study of the holy Fathers has also shed light upon the theology of the mystery of the Eucharist through the teachings of such illustrious Fathers of Christian antiquity as Saint Irenaeus, Saint Ambrose, Saint Cyril of Jerusalem, and Saint John Chrysostom.
9. For this reason, the "norm of the holy Fathers" requires not only the preservation of what our immediate forebears have passed on to us, but also an understanding and a more profound study of the Church's entire past and of all the ways in which her one and only faith has been set forth in the quite diverse human and social forms prevailing in the Semitic, Greek, and Latin areas. Moreover, this broader view allows us to see how the Holy Spirit endows the People of God with a marvelous fidelity in preserving the unalterable deposit of faith, even amid a very great variety of prayers and rites.
I can't help but seeing "Borg" whenever I see this.
SD