43 All the believers in Christ are organically united with Him (Rom. 12:4-5) and constituted with His life and element (Col. 3:4, 11) and have thus become His Body, an organism to express Him; hence, Christ is not only the Head but also the Body.
54 The Bible considers Christ and the church as one mysterious Christ; Christ is the Head of this mysterious Christ, and the church is the Body of this mysterious Christ—Acts 9:4-5; Eph. 5:32.
13Further Reading: The Conclusion of the New Testament, msg. 212; CWWL, 1965, vol. 2, “Christ as the Content of the Church and the Church as the Expression of Christ, “ch. 2