The body depends on itself to heal properly. When you cut yourself off from the body, healing can t take place. Yes, even people have died who would not have had too. The Bible suggests so. The inference here is koinonia.
Close relationship allows the continual cleansing of sin.
If a member of the body is disconnected then the flow of blood is cut off. Schism is a dangerous thing. Communion centers on the blood of Jesus and its power to cleanse from all sin, especially prejudice, discrimination and partiality. The wall has been broken down by Christ s death on the cross. I believe this very thing, the failure to discern, has caused immaturity, dullness and blindness to the things of God.