Some Christians don’t want to be connected to other members of the body of Christ. They commune with Jesus, but they deliberately isolate themselves from other believers. They want nothing to do with the body, other than the head.
A body can’t be comprised of just a single member, though. Can you picture a head with only an arm growing out of it? Christ’s body can’t be made up of a head alone, with no limbs or organs. His body consists of many members. We are knit together not only by our need for Jesus but also by our need for each other.