The eye cannot say to the hand, “I have no need of yoʋ,” nor in turn can the head say to the feet, “I have no need of you.”
If the whole body were an eye, where would the sense of hearing be? If the whole body were an ear, where would the sense of smell be?
As it is, there are many members, yet one body.
On the contrary, the members of the body that seem to be weaker are essential,