The eye can’t say to the hand, “I don’t need you!” The head can’t say to the feet, “I don’t need you!”
As it is, there are many parts, but there’s only one body.
It’s just the opposite! The parts of the body that seem to be weaker are the ones we can’t do without.
If the whole body were an eye, how could it hear? If the whole body were an ear, how could it smell?