John Chrysostom

"Am I not an Apostle? am I not free? have I not seen Jesus Christ our Lord? are not ye my work in the Lord?" Inasmuch as he had said, "If meat make my brother to stumble I will eat no flesh forever;" a thing which he had not yet done, but professed he would do if need require: lest any man should say, "Thou vauntest thyself at random, and art severe in discourse, and utterest words of promise, a thing easy to me or to any body; but if these sayings come from thy heart, shew by deeds something which thou hast slighted in order to …

Homily on 1 Corinthians 21 ↗

Theophylact of Ohrid

Having said: if food causes my brother to stumble, I will never eat meat, lest anyone consider him boastful and self-praising, he is compelled at last to declare that he abstained even from what was permitted, so as not to cause anyone to stumble. Whereas Christ commanded the preacher of the Gospel to live from the Gospel (Luke 10:7), that is, at the expense of those being taught, I, he says, rather chose to waste away from hunger and take nothing from you, but to work with my own hands and sustain myself by my own labors. …

Commentary on 1 Corinthians ↗