Second Corinthians is thought to be a composite of at least two of Paul's letters. The first nine chapters are rather boring and of quite a different tone than the last four chapters - in which Paul brags about all the things he's done and threatens those who disagree with him.
Among all the bragging, though, Paul tells us something interesting about himself. A messenger of Satan put a thorn in his flesh to restrain him.
The text and notes for this episode can be found here: https://skepticsannotatedbible.com/fewer-words/284.html
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