Ambrosiaster : This is what he says to the Galatians: If I have destroyed, I also rebuild, I appoint myself a transgressor (Galatians 2:18). Therefore, faithfully proclaim the teaching of God: for this is what deceivers do. Often, in order not to offend people, they omit what is true. — Commentary on 2 Corinthians John Chrysostom : "But as God is faithful, our word toward you was not yea and nay." He skillfully overturns a rising objection. For one might say, If after having promised, thou hast put off coming, and yea is not yea, and nay nay, with thee, but what thou sayest now thou unsayest afterwards, as thou didst in the case of this Journey: woe is unto us, if all this were the case in the Preaching too. Now lest they should have these thoughts and be troubled thereat, he says, "But as God is faithful, our word toward you was not yea and nay." This, saith he, was not the case in the Preaching, but only in our travels and journeyings; whereas whatever things we have said in our preaching, these abide steadfast and unmoveable, (for he calleth his preaching here, "word.") Then he bringeth proof of this that cannot be gainsaid, by referring all to God. What he saith is this; "the promise of my coming was my own and I gave that promise from myself: but the preaching is not my own, nor of man, but of God, and what is of God it is impossible should lie." Whereupon also he said, "God is faithful," that is, "true." "Mistrust not then what is from Him, for there is nought of man in it." — Homily 3 on 2 Corinthians