1 Corinthians 12:22-26

But quite the contrary, the parts of the body that seem to be weaker are [absolutely] necessary; and as for those parts of the body which we consider less honorable, these we treat with greater honor; and our less presentable parts are treated with greater modesty, while our more presentable parts do not require it. But God has combined the [whole] body, giving greater honor to that part which lacks it, so that there would be no division or discord in the body [that is, lack of adaptation of the parts to each other], but that the parts may have the same concern for one another. And if one member suffers, all the parts share the suffering; if one member is honored, all rejoice with it.