Apostle Paul's Thorn in the Flesh

Apostle Paul's "thorn in the flesh" was a persistent, painful affliction that God allowed to keep him humble, described in 2 Corinthians 12 as a "messenger of Satan to buffet me," but its exact nature is unknown, with popular theories suggesting physical ailments (like eye trouble), spiritual temptations, or constant persecution, though its ambiguity serves to make it relatable to everyone's struggles, teaching that God's grace is sufficient in weakness.