“it is a difficult book, but it contains many riches.”
How true. I’m so glad more Catholic apologists are coming out with books on Revelation. Too many Protestant sources on it are filled with sensationlist, literalist errors. It is impossible to understand the Book of Revelation properly without having some understanding of the Mass, which is the Sacrifice of the Lamb.
Actually, understanding of Revelation comes from studying all the Books preceding it, most especially, those from the Old Testament.