John Chrysostom

After giving the doxology then, he again goes from prayer to exhortation, directing his discourse against the stronger, and saying as follows: "We then that are strong, ought"-it is "we ought," not "we are so kind as to." What is it we ought to do?-"to bear the infirmities of the weak." See how he has roused their attention by his praises, not only by calling them powerful, but also by putting them alongside of himself. And not by this only, but by the advantage of the thing he again allures them, and by its not being burdensome. …

Homily on Romans 27 ↗

Theophylact of Ohrid

After the prayer he again offers exhortation and gratifies the perfect by placing them on the same level as himself and calling them strong. He did not simply say "weaknesses," but "the weaknesses of the powerless," that is, intensifying the expression in order to draw them to greater compassion. Having spoken of our obligation to bear the weaknesses of others, he teaches how to fulfill it. For this, he says, it is necessary that we seek not only our own benefit.

Commentary on Romans ↗

Thomas Aquinas

The Apostle taught above that the stronger should avoid scandalizing the weak; here he teaches that the stronger should bear with the failings of the weak. In regard to this he does two things: first, he proposes an admonition; second, he clarifies it, at let every one of you. This admonition contains two parts: the first pertains to external behavior. Hence he says: not only should we avoid scandalizing the weak, but we who are stronger in faith ought to bear the infirmities of the weak. …

Commentary on Romans ↗