If God did not want us to understand the book of Revelation, He would not have given it to us at all.
There's no better book with which to defend the Bible than the Bible itself.
Go through John's Gospel, and study the "believes," the "verilys," the " I ams; "and go through the Bible in that way, and it becomes a new book to you.
I am glad there are things in the Bible I do not understand. If I could take that book up and read it as I would any other book, I might think I could write a book like that.