This message begins a four-week series on the topic of ecclesiology: the church. Ephesians refers to Jesus’ followers as the “body of Christ” because each believer is brought into union with Christ when we become Christians. We are also brought into union with each member of the body of Christ, so that just as we bear a special connection to Christ, we bear a special connection to every other believer also.
This is why Paul exhorts us to maintain the unity of the Spirit: we are in fact one, let’s live like it! This oneness will show the world that God is doing something in our midst.