Isn’t it great!?! I got it from a wonderful book by Scott Hahn called “The Lord’s Supper.” In it, he takes Revelations and shows how significant that hard-to-understand book is when one applies it to the Mass itself. It is fabulous. I learned so much about Revelations when I read this book. I highly recommend it.
I’ve read that book! Funny, I don’t remember the portion that you posted here. But I do remember the relations of the Mass to Revelation and to Isaiah that Hahn wrote about. Fascinating book.