Paul prayed three times to have his thorn removed. We don’t know what the thorn was.
The Greek word used in the original text meant thorn or stake.
Some believe it was some sort of chronic ailment that plagued him (thorn in the flesh).
Some believe it was all the ongoing trials of the previous chapters (messenger of Satan).
I am glad we don’t know what it was, If we knew everybody would want it.
We would pray for the “gall-stones” of Paul, or the “failing eyesight of the Great Apostle,” Whole liturgies would be written and read in the churches…
God knew our propensity and disallowed Paul to identify it.