This book reviews what the Bible carefully and deliberately describes as "Churches of God" - both what they should be and what they should do. Topics include the scriptural use of the term "church", the significance of "of God", the first church of God, churches of God as "one thing", shepherds of the flock, mutual responsibilities of churches of God, the maintenance of spiritual life, subjection in a kingdom, a holy priesthood, a house of prayer, ministers and ambassadors, and stewards of the mysteries of Christ.