Thanks for the link, and for preserving this!
Here is an excerpt:
A valuable feature of this technique of gradualism is that at each new step a certain pre-
cedent is established, one which at a later time can be referred to as a support for the more
advanced changes. Thus, after the serious and invalidating mutilations of the Mass had already
been made, it was of no avail to point out to the "new robbers" the decree Quo Primum or to in-
sist upon the unchangeable nature of the Canon of the Mass, for they could readily refer to good
Pope John who, by personally inserting the name of St. Joseph in the Canon, had been the very
first person ever to change it. This argument, of course, is supposed to be "unanswerable."