This document provides a summary of Lesson 12 from a study on the letters to the seven churches in Revelation. It examines the qualities, controversies, advice, and promises that Jesus gives to each church: Ephesus, Smyrna, Pergamum, Thyatira, Sardis, Philadelphia, and Laodicea. It encourages applying the messages to one's own life and church. The conclusion emphasizes that Christ watches over the church and keeps it safe through the Holy Spirit.