“The eye cannot say to the hand, "I have no need of you," nor again the head to the feet, ‘I have no need of you’” (v21). Paul’s idea of “church” was neither a building nor an audience of people who listened to or watched a performance. “Church” was the gathering of the Body of Christ, each member being essential to healthy functioning: eyes, ears, hands, feet, etc. Some (v28-29) had more visible, leadership gifts, but they needed the rest of the Body to be whole. Connected in Christ, the members suffer and rejoice together (v26).
Whatever our background (v13), we have received the same Spirit. Rather than competition and divisions, we are called to serve one another (v25).