Romans 12:4-5 For just as in one body we have many members, and all the members do not have the same function, so we who are many are one Body in Christ, and individually members one of another.
We are one Body in Christ, having an organic union with Him. This union makes us one in life with Him and with all the other members of His Body. The Body is not an organization or a society but is altogether an organism produced by the union in life that we have with Christ. (Rom. 12:5, footnote 1)
The purpose of God’s salvation is to have Christ reproduced in millions of saints that they may become the members of His Body, not separate and complete individual units but parts of a living, functioning, coordinated, corporate whole. Although these parts have different functions, they are not detached from one another. Rather, they are “individually members one of another.” Each member is organically joined to all the others, and each needs the function of all the others. All the members must be coordinated together to practice the Body life that is revealed in this chapter. (Rom. 12:5, footnote 2)