The background of this book is that culture had been mixed into the church life in Colossae. Originally, Christ was the unique element in the church life, yet at that time a disturbance was created because Christ was being replaced by culture. The constituent of the church should be Christ and Christ alone, yet the church had been invaded by certain elements of culture — especially religion, in the form of asceticism related to Judaic ordinances and observances (Col. 2:16, 20-21), and philosophy, in the form of mysticism related to Gnosticism and the worship of angels (Col. 2:8, 18). Hence, the central concept of this book is that nothing should be allowed to replace Christ.
This book concentrates on Christ as the Head of the Body. It reveals the profoundness, all-inclusiveness, and unlimitedness of Christ to a fuller extent than any other book in the Bible.