John Chrysostom

"And who is sufficient for these things?" Seeing he had uttered great things, that 'we are a sacrifice of Christ and a sweet savor, and are every where made to triumph,' he again useth moderation, referring all to God. Whence also he saith, "and who is sufficient for these things?" 'for all,' saith he, 'is Christ's, nothing our own.' Seest thou how opposite his language to the false Apostles'? …

Homily 5 on 2 Corinthians ↗

Theophylact of Ohrid

Since he said: "we are a fragrance even among those who are perishing," lest you think that those who perish are also pleasing and acceptable to God, he added the following: smelling this fragrance, some are saved, while others perish. Just as myrrh, they say, suffocates swine and beetles, so too Christ was set as a stone of stumbling and offense. Likewise, fire purifies gold but burns up thorns. Since he said so much with the words "we are a fragrance," and "we triumph," he again tries to temper his speech. …

Commentary on 2 Corinthians ↗

Thomas Aquinas

But is that fragrance related to the good and the wicked in the same way? No, but to one a fragrance from death to death, i.e., of envy and malice, which are the occasion of bringing them to eternal death, i.e., those who envy the good reputation of the Apostle and strive against the preaching of Christ and the conversion of the faithful: "This child is set for the fall and rising of many in Israel, and for a sign that is spoken against" (Lk. 2:34). …

Commentary on 2 Corinthians ↗