John Chrysostom
“And not only that, but we also glory in tribulations.” Understand, then, what the future blessings are, since we magnify ourselves even in what seems sorrowful to us. Such is God's gift, and in it there is nothing unpleasant. In external affairs, contests are accompanied by labor, sickness, and misfortune, while crowns and rewards bring pleasure. But there it is not so. The struggle itself is no less pleasant to us than the reward. Since trials then were numerous, while the Kingdom was only in hope, misfortunes were at hand and blessings were in expectation. All this weakened the infirm even more. Therefore Paul gives them rewards even before the heavenly crowns, saying that one must boast also in tribulations.
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Yet he did not say, “you must boast,” but says, “we boast,” presenting the exhortation in his own example. Then, since what was said seemed strange and extraordinary, he explains it. A man struggling with hunger, in chains and torments, insulted and humiliated, is to boast in these things. More importantly, the Apostle affirms that present sorrows are worthy of boasting not only because of future blessings, but even in themselves. Sorrows in themselves are good. Why? Because they train us in patience. Therefore, after saying, “we glory in tribulations,” he added the reason: “knowing that tribulation produces patience.” Notice again Paul's skill, how he turns his discourse completely to the opposite. Since tribulations most often made Christians renounce future blessings and cast them into despair, he asserts that because of tribulations one should hope, not despair, concerning the future. See Rom 5:4.