2 Corinthians 1:20

ὅσαι γὰρ ἐπαγγελίαι κ. τ. λ.: for how many soever be the promises of God, in Him is the Yea. Not only was Christ a διάκονος περιτομῆς … εἰς τὸ βεβαιῶσαι τὰς ἐπαγγελίας τῶν πατέρων (Romans 15:8), but He is Himself, in His own Person, the true fulfilment and recapitulation of them all (cf. Galatians 3:8). διὸ καὶ διʼ αὐτοῦ τὸ Ἀμήν κ. τ. λ.: wherefore also through Him is the “Amen,” to the glory of God, through us. The reading of the received text conceals the force of these words. It is because Christ is the consummation, the “Yea” of the Divine promises, that the “Amen” is specially fitting at the close of doxologies in public worship (1 Corinthians 14:16). The thought of the fulfilment of God's promises naturally leads to a doxology (Romans 15:9), to which a solemn Ἀμήν, the Hebrew form of the Greek ναί, whose significance as applied to Christ has just been expounded, is a fitting climax. διʼ ἡμῶν in this clause includes, of course, both St. Paul and his correspondents; it refers, indeed, to the general practice of Christians in their public devotions.