Revelation 19:14 And the armies which were in heaven followed him upon white horses, clothed in fine linen, white and clean.
This book details the 7 stages of time that will lead to the return of Jesus to do away with evil and restore the earth to the perfect paradise it was in the Garden Of Eden before the fall of man. It is not about setting dates, it is about how God's patience with His creation has ran out time and time again and will someday result in Jesus returning to once and for all do away with evil.
