John Chrysostom
“Bear one another's burdens.” Since it is impossible, being human, to be free from faults, the Apostle urges us not to be severe judges of others' failings. Rather, we must patiently bear the defects of our neighbors, so that others may bear our own defects.
When a building is constructed, not all stones have the same purpose. One is suited for a corner, but not for the foundation. Another is suited for the foundation, but not for a corner. Undoubtedly, it is the same in the Body of the Church.
Likewise, each person can see the same thing in our own body. Yet one member endures another, and we do not demand everything from each of them. For both the body and the building are composed from a union of diverse parts.
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“And so fulfill the law of Christ.” He did not say “fulfill” (plerosate), but “complete” (anaplerosate), that is: “Fulfill it all together by your common strength, bearing one another's defects.”
For example, one man is quick-tempered, and you are sluggish. In that case bear his stormy impulses, so that he may bear your sluggishness. Thus he will not sin when he meets condescension from you. You also will not err, once your brother bears in you what is burdensome to him.
Therefore, give one another a helping hand when there is danger of falling. Fulfill the law by your common strength, each one supplying his neighbor's defects by patience. If you do not act this way, but each judges his neighbor's actions, you will never attain what you ought to attain.
So too with the body. If someone demands the same service from all its members, the body will in no way stand. Likewise great enmity will arise among the brethren if we demand everything from each person.