John Chrysostom

"Wherefore, if meat make my brother to stumble, I will eat no flesh for ever." This is like the best of teachers, to teach in his own person the things which he speaks. Nor did he say whether justly or unjustly; but in any case. "I say not," (such is his tone,) "meat offered in sacrifice to an idol, which is already prohibited for another reason; but if any even of those things which are within license and are permitted causes stumbling, from these also will I abstain: and not one or two days, but all the time of my life." For he …

Homily on 1 Corinthians 20 ↗

Theophylact of Ohrid

As an excellent teacher, he proves by his own example what he speaks about. And he did not say: "if it causes to stumble" justly, but in whatever way it may be. He also did not say: "I will not eat" food offered to idols, but meat in general, even if it were permitted. He did not say, again: for one or two days, but for his whole life; for this is what "forever" means. He did not say, finally: so as not to destroy, but only: "so as not to cause to stumble."

Commentary on 1 Corinthians ↗

Cyprian

Moreover, what a number of serious mischiefs we see to have arisen hence; and what a multitude of virgins we behold corrupted by unlawful and dangerous conjunctions of this kind, to our great grief of mind! But if they have faithfully dedicated themselves to Christ, let them persevere in modesty and chastity, without incurring any evil report, and so in courage and steadiness await the reward of virginity. …

Epistle LXI ↗