A.T. Robertson Commentary 2 Corinthians 11:31

"The God and Father of the Lord Jesus, he who is blessed for evermore knoweth that I lie not." — 2 Corinthians 11:31 (ASV)

I am not lying (ου ψευδομα). The list seems so absurd and foolish that Paul takes solemn oath about it (cf. 1:23). For the doxology see Ro 1:25; 9:5.