John Chrysostom

"That there should be no schism in the body." Next he also adds the reason, showing that with a view to their profit he both caused it to lack and more abundantly honored it. And what is the reason? "That there should be no schism," saith he, "in the body." (And he said not, "in the members," but, "in the body.") For there would indeed be a great and unfair advantage, if some members were cared for both by nature and by our forethought, others not even by either one of these. …

Homily on 1 Corinthians 31 ↗

Theophylact of Ohrid

It is not enough, he says, that the members not be divided, but there must be great love and harmony among them; and each one must care for and look after the least member, and care not simply, but "equally," that is, so that the least member enjoys the same care as the important one. Thus, when a thorn falls and pierces the heel of the foot, the whole body feels it and takes care: the head bends down, the back curves, the belly and thighs contract, the eyes look with great attentiveness, the hands pull out the splinter. …

Commentary on 1 Corinthians ↗

Thomas Aquinas

Secondly, he proposes the final cause, saying: That there be no discord in the body. Which, of course, would follow, if no help were given to the body, is openly avoided, as long as the peace of the Church is maintained by giving to each person whatever is necessary. Hence it was said above (1:10): "Let all of you agree and let there be no dissensions among you." But in regard to the members of the natural body, there would be division in the body, if the due proportion of the members were removed. …

Commentary on 1 Corinthians ↗