2 Corinthians 1:20

For all the promises of God in him are yea Literally, for how many soever the promises of God be, in Him is the yea. The Apostle here, as elsewhere, reminds us that God's gifts depend upon His promise. Galatians 3:14-29. And this promise is an affirmative utterance, never to be withdrawn or explained away. Whatever gifts are received by the ministration of His servants are the same in their character.

and in him Amen This may refer either (1) actively, to the ratification by God of His own promises, see Hebrews 6:12-18; Hebrews 7:20-21; Revelation 3:14; or (2) passively, to the security wemay feel that His Divine Word will never fail us. But our security is ever in Him. Some editors read (with the Vulgate) -wherefore through him is the Amen," in which case the meaning would be that becauseGod's promises were unchangeable, they were to be depended upon.

unto the glory of God by us i.e. through our instrumentality, because by the first preachers of the Gospel these glorious promises were made known.