People who are part of a particular congregation are often called church “members.” This language is profoundly biblical, and is a visible, covenantal manifestation of the believer’s union with Christ.

μέλος (melos) is the Greek word used to describe the individual parts of a body (literally “body member”). For example, the tongue is an individual member of the body (James 3:5-6). μέλος is used metaphorically to describe the relationship between believers and Christ. Individual believers are all μέλη (members) of Christ (Romans 12:4-5), because we are in Christ. This union with Christ is total: even our bodies, as part of ourselves, are μέλη of Christ (1 Corinthians 6:15, Ephesians 5:29-30). We have been united to Christ as his members through the work of the Holy Spirit (1 Corinthians 12:12-13). The abiding of John 14 is best described in terms of our union with Christ, our membership in and with him…