17 Are you now going to accuse me of being flip with my promises because it didn't work out? Do you think I talk out of both sides of my mouth - a glib yes one moment, a glib no the next? 18 Well, you're wrong. I try to be as true to my word as God is to his. Our word to you wasn't a careless yes canceled by an indifferent no. How could it be? 19 When Silas and Timothy and I proclaimed the Son of God among you, did you pick up on any yes-and-no, on-again, off-again waffling? Wasn't it a clean, strong Yes? 20 Whatever God has promised gets stamped with the Yes of Jesus. In him, this is what we preach and pray, the great Amen, God's Yes and our Yes together, gloriously evident.
Matthew Henry's Commentary on 2 Corinthians 1:17-20
Commentary on 2 Corinthians 1:15-24
(Read 2 Corinthians 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.