Reference

Revelation 1:3
Grasping the Book of Revelation

Revelation is the only book of prophecy in the New Testament. It is the only book in the divine library that especially promises a blessing to those who read and hear. God blesses the one who reads the words of this prophecy to the church, and he blesses all who listen to its message and obey what it says, for the time is near. 

Revelation says itself, but after reading the first chapters about the churches, and the last chapters describing heaven, not many of its read much of this book.