John Chrysostom

"We are pressed on every side, yet not straitened; perplexed, yet not unto despair; pursued, yet not forsaken." He still dwells upon proving that the whole work is to be ascribed to the power of God, repressing the highmindedness of those that glory in themselves. 'For not this only,' saith he, 'is marvelous, that we keep this treasure in earthen vessels, but that even when enduring ten thousand hardships, and battered on every side, we [still] preserve and lose it not. …

Homily 9 on 2 Corinthians ↗

Theophylact of Ohrid

To such a degree, he says, everything is a matter of God's power, that although we are earthen vessels and are subjected to so many and such varied trials, we are nevertheless not shattered and do not lose the treasure that is within us. For we are afflicted at all times, in every place, and in every matter, among friends, among enemies, "but not crushed," because God enlarges our hearts. …

Commentary on 2 Corinthians ↗

Clement of Alexandria

...blessed then will he be, and truly proclaimed perfect, "that the excellency of the power may be of God, and not of us," as the apostle says. Only let us preserve free-will and love: "troubled on every side, yet not distressed; perplexed, but not in despair; persecuted, but not forsaken; cast down, but not destroyed." For those who strive after perfection, according to the same apostle, must "give no offence in anything, but in everything approve themselves not to men, but to God."

The Stromata Book 4 ↗

Thomas Aquinas

Then when he says, we are afflicted in every way, he shows their patience in the things they suffer. In regard to this he does two things: first, he points out the evils they suffer in general; secondly, he mentions them in particular (v. 8b). He says, therefore: truly we have this treasure in earthen vessels, because we are afflicted in every way. As if to say: no type of tribulation has missed us: "Through many tribulations we must enter the kingdom of God" (Ac. 14:22). …

Commentary on 2 Corinthians ↗