1 Corinthians 12:15, 18-20

If the foot says, “Because I am not a hand, I am not a part of the body,” is it not on the contrary still a part of the body?

But now [as things really are], God has placed and arranged the parts in the body, each one of them, just as He willed and saw fit [with the best balance of function]. If they all were a single organ, where would [the rest of] the body be? But now [as things really are] there are many parts [different limbs and organs], but a single body.