Jamieson, Fausset and Brown on 2 Corinthians 11:23

23. I speak as a fool--rather, as Greek, "I speak as if beside myself"; stronger than "as a fool."

I am more--namely, in respect to the credentials and manifestations of my ministry, more faithful and self-denying; and richer in tokens of God's recognition of my ministry. Old authorities read the order thus, "In prisons above measures, in stripes more abundantly" (English Version, less accurately, "more frequent"). Ac 16:23-40 records one case of his imprisonment with stripes. Clement of Rome [First Epistle to the Corinthians] describes him as having suffered bonds seven times.

in death oft--(2Co 4:10; Ac 9:23; 13:50; 14:5, 6, 19; 17:5, 13).