First Love
Many Christians avoid the book of Revelation because it seems so mysterious. Yet John wrote, "Blessed is he who reads and those who hear the words of the prophecy, and heed the things which are written in it; for the time is near..." (Revelation 1:3 NAS).
Though written by John, it is the Revelation of Jesus Christ (Revelation 1:1). It is the heart of God revealed to Christ and shared by John.
John was one the three pillars in the church at Jerusalem. Much of what we know about him was recorded by Iraneus, who got it first hand from Polycarp, a student of John.