We Catholics do (at least in many cases, all of my experience anyway) say this very thing after saying the Lords Prayer in Mass. If you wish to add this when saying it personally, you can go for it. However do so knowing that it is not a part of the prayer, and it is not anything our Lord ever uttered. This segways beautifully into my recommending the following book, which every Christian (esp non-catholics) should read:
Where We Got the Bible… Our Debt to the Catholic Church
By Bishop Henry G. Grahm - Who converted from super calvinist church of englander to Roman Catholic (I beleive just prior to writing this book).
This book enlightens us as to how the Protestant belief of Sola Scriptura has lead them to nearly universally believe our Lord uttered these words, and is actually a beautiful illistration of the fallocy of this doctrine.
Now for starters, what we have to understand is that “For thine is the kingdom, the power and the glory” is something that developed with in the context of early christianity. It was something early christians came up with to sort of… Add and exclamation point on certain things. As such, it was something that really moved a lot of early christians, including the early scribes. This is important because for many thousands of years, the bible was kept alive (by the Catholic chruch BTW) through monks and scribes copying, by hand the whole of it repeatedly. Some scribes, would add thier own notes to the sides of pages. It was understood (at the time) that this was not gospel text, but that scribes helpful interpetation or thoughts. “For thine is the kingdom, the power and the glory” was just one such example of one of these notes, which at some point a later scribe confused for gospel text! That’s right, at some point this got added to early protestant bibles as gospel text for no reason other than a scribe, some where along the way accidently thought that was a part of the Gospel when it was never a part of it, it was just a note that scribe added to add his enthusiasm, his exclamation mark to the lords prayer!
And to this vary day, even with better translations out there, protistants still think that’s part of the prayer, but it isn’t. Thus is the problem with Sola Scriptura. God never promised that every scribe ever to copy the bible would be inspired to not mess up. Scribes did mess up, there were over 200,000 variations in Gospel text copied (by hand) over the years. The only known good, accurate fully repersentitve of the original text version we have is the Vulgate (and not Novo Vulgate), a Catholic bible btw
For Catholics (and Orthodox) this isn’t a problem. We understand that Christ didn’t leave us a dead book, subject to copy and translation error to guide our faith. But rather left a living, breathing teaching institution (the church) to guide our faith and morals. Proestants on the other hand well… I guess I can’t speak for you, but I would be questioning my own beliefs right now if I was one
Aren’t you glad you switched teams?