Commentaries
1:15-24 The apostle clears himself from the charge of levity and inconstancy, in not coming to Corinth. Good men should be careful to keep the reputation of sincerity and constancy; they should not resolve, but on careful thought; and they will not change unless for weighty reasons. Nothing can render God's promises more certain: his giving them through Christ, assures us they are his promises; as the wonders God wrought in the life, resurrection, and ascension of his Son, confirm faith. The Holy Spirit makes Christians firm in the faith of the gospel: the quickening of the Spirit is an earnest of everlasting life; and the comforts of the Spirit are an earnest of everlasting joy. The apostle desired to spare the blame he feared would be unavoidable, if he had gone to Corinth before he learned what effect his former letter produced. Our strength and ability are owing to faith; and our comfort and joy must flow from faith. The holy tempers and gracious fruits which attend faith, secure from delusion in so important a matter.
20. Rather, How many soever be the promises of God, in Him is the "yea" ("faithfulness in His word": contrasted with the "yea and nay," 2Co 1:19, that is, inconstancy as to one's word).
and in him Amen—The oldest manuscripts read, "Wherefore through Him is the Amen"; that is, In Him is faithfulness ("yea") to His word, "wherefore through Him" is the immutable verification of it ("Amen"). As "yea" is His word, so "Amen" is His oath, which makes our assurance of the fulfilment doubly sure. Compare "two immutable things (namely, His word and His oath) in which it was impossible for God to lie" (Heb 6:18; Re 3:14). The whole range of Old Testament and New Testament promises are secure in their fulfilment for us in Christ.
unto the glory of God by us—Greek, "for glory unto God by us" (compare 2Co 4:15), that is, by our ministerial labors; by us His promises, and His unchangeable faithfulness to them, are proclaimed. Conybeare takes the "Amen" to be the Amen at the close of thanksgiving: but then "by us" would have to mean what it cannot mean here, "by us and you."