The human body has many parts, but the many parts make up only one body. So it is with the body of Christ. 1 Corinthians 12:12.
Paul compares the body of Christ to a human body. Each part has a specific function that is necessary to the body as a whole. The parts are different for a purpose, and in their differences they must work together.
Oh how beautiful it is when we come together as one body by the working of the Holy Spirit we become all part of God's family.