Could you locate for me where where it has been asserted even once, by anybody?
Aside from my post 178 where I answered your question regarding unanimity among the ECFs....
We have this post below from one of your fellow Roman Catholics.
The Church's Constant Teaching on our dealings with Non-Catholics
http://freerepublic.com/focus/religion/3488688/posts?q=1&;page=51
Your arguments are falling apart, Mrs.D.
Neither do your quotes from the ECFs indicate any such thing.
You may have missed the phrase "in any sense at all". Obviously Catholic doctrine does change in the sense of "development of doctrine." This refers to a doctrine being reaffirmed and clarified in the light of new situations, being re-stated to answer new questions, being widened or refined in its application, being deepened, extended, elaborated, made more precise, etc. etc.
All that can change, and does. It is not contradiction, it is development.
What does not happen in Catholic doctrine, is abrogation. Something that was true 20 centuries ago, was true 200 years ago, was true 20 years ago, and will be true two or three or a thousand pontificates from now, per omnia saecula saeculorum, until Christ comes again.
And even if any FReeper Catholic could be found who erred on either side --- who said either that "nothing changes in any sense" or that "the basic doctrines do change," --- that FReeper Catholic would be factually in the wrong, and his/her remarks would need to be corrected by some rmemedial catechist.
Which --- God help us all! --- seems to be my vocation!