1 Corinthians 12:15, 18-20

If the foot should say, “Because I am not a hand, I do not belong to the body,” that would not make it any less a part of the body.

But as it is, God arranged the members in the body, each one of them, as he chose. If all were a single member, where would the body be? As it is, there are many parts, yet one body.