1 Corinthians 12:18-21

18But in fact God has placed the parts in the body, every one of them, just as he wanted them to be. 19If they were all one part, where would the body be?

20As it is, there are many parts, but one body. 21The eye cannot say to the hand, “I don’t need you!” And the head cannot say to the feet, “I don’t need you!”