John Examines the Power of True Bible Doctrine Through the Lens of Love Before being exiled to the island of Patmos where he wrote the book of Revelation, the apostle John penned three letters to the church at Ephesus. The Ephesian church was the largest in the ancient world and faced, as many churches of that time did, the dangerous doctrines of Jewish legalism and Hellenistic Gnosticism. The church was also dealing with...