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 also dealt with false leaders more interested in gain and fame than in spreading the truth of the gospel. In response,...