What was Paul's thorn in the flesh?

Paul speaks of a “thorn in the flesh” in 2 Corinthians 12:7. He calls it “a messenger of Satan” that had a purpose of “torment.” Many explanations have been put forward, but whether Paul is referring to a physical, spiritual, or emotional affliction—or something else entirely—has never been answered with satisfaction. Since he was not talking of a literal thorn, he must have been speaking metaphorically. Some of the more popular theories of the thorn’s interpretation include temptation, a chronic eye problem, malaria, migraines, epilepsy, and a speech disability. Some even say that the thorn refers to a person, such as Alexander the coppersmith, who did Paul “a great deal of harm” (2 Timothy 4:14). No one can say for sure what Paul’s thorn in the flesh was, but it was a source of real pain in the apostle’s life.

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