THE BOOK OF REVELATION

All believers should read this book for the blessings promised in it.
Blessed is he that readeth, and they that hear the words of this
prophecy, and keep those things which are written therein for the time
is at hand.

Rev. 1: 3.

Since there are many things in this book that we may not understand I
recommend that one read it many times for a better understanding and
for more blessings.

Then, before we begin trying to explain parts that may not be clear we
should read  Rev.22: 18 thru.19.

For I testify unto every man that heareth
  the words of the prophecy of this book, if any man shall add unto
these things, God shall add unto him the plagues that are written in
this book: And if any man shall take away from the words of the book of
this prophecy, God shall take away his part out of the book of life,
and out of the holy city, and from the things which are written in this
book.

Those two verses are clear and it is most important that we give
attention to their warnings!!!