The Biblical significance of Patmos, hidden for many centuries, was only rediscovered in the 11th century when a Byzantine abbot, with imperial help, established a monumental fortress-like monastery on the island and dedicated it to St. John John who had been an eyewitness of the incarnate Christ, has a vision of the glorified Christ. God also reveals to him what is to take place in the future-Judgment and the ultimate triumph of God over evil. The book of Revelation has 22 chapters. The central concern is the Second Coming of the Lord as judge and king. Another major theme is the struggle between good and evil, between light and darkness, between the kingdom of God, the Church, and the power opposed to it, and the final triumph of the Church through Jesus Christ.
Revelation is a book of hope.
It is one of the most encouraging books of the New Testament. In it, John talks about the ultimate defeat of evil and the glorious return and reign of the Lord Jesus Christ. But Revelation is also a book of warning. Things are not as they should be in the churches , so Christ calls them to commit themselves to live in righteousness. For the most part the book consists of several series of revelations and visions presented in symbolic language that would have been understood by Christians of that day, but would have remained a mystery to all others.