The Phrase Today
"A thorn in my flesh" and "a thorn in my side" are among the most widely used English metaphors for any persistent, chronic irritation or difficulty that resists resolution. A troublesome colleague, a recurring legal dispute, a nagging physical condition, or an unresolvable political problem can all be someone's thorn in the flesh. The phrase is valued precisely because it implies that the difficulty is ongoing, deeply personal, and stubbornly unresponsive to remedies.
Biblical Origin
Paul wrote in 2 Corinthians 12:7 in the King James Bible: "And lest I should be exalted above measure through the abundance of the revelations, there was given to me a thorn in the flesh, the messenger of Satan to buffet me, lest I should be exalted above measure." The phrase appears in the context of Paul's account of being caught up to paradise and hearing inexpressible things. The thorn was given precisely to prevent spiritual pride. Paul prayed three times for its removal; God's response was not healing but assurance: "My grace is sufficient for thee: for my strength is made perfect in weakness."
The Exegetical Tradition
Paul's deliberate vagueness about the thorn's nature generated one of the longest-running debates in New Testament scholarship. The candidates include: epilepsy (Jerome, Calvin), severe ophthalmia or eye disease (Lightfoot, citing Galatians 4:15 where Paul mentions the Galatians' willingness to give him their eyes), a speech impediment (Chrysostom), migraines, malaria contracted in Pamphylia, a spiritual tempter, and ongoing opposition from Jewish opponents. The mystery is almost certainly intentional - Paul's reticence invites every suffering Christian to identify their own thorn with his, which is part of the pastoral genius of the passage.
Semantic Drift
The modern phrase has shed the theological framework of pride-prevention, divine grace, and productive weakness. In secular usage it simply denotes an annoying, persistent problem. But something of the original's resignation survives: calling a difficulty a thorn in the flesh implies that one has tried to remove it and failed, that it must be lived with rather than solved, and that some things simply accompany productive life without resolution.
Historical Usage
John Bunyan in The Pilgrim's Progress (1678) drew heavily on the thorn-in-the-flesh framework to describe the Christian's persistent internal struggle. John Wesley wrestled with the passage in his journals, applying it to his own spiritual difficulties. Charles Spurgeon preached multiple sermons on the verse, arguing that affliction was a divine pedagogical tool. In secular literature, Robert Browning's dramatic monologues return repeatedly to the theme of productive suffering - the creative person burdened by some inner difficulty that both torments and animates.
Cross-Linguistic Reach
The phrase transferred easily into European languages: French une épine dans la chair, German ein Dorn im Fleisch, Spanish una espina en la carne. In each case the biblical source is clearly acknowledged in theological dictionaries, while the idiom circulates independently in secular writing. The concept of chronic, identity-shaping suffering that cannot be removed but can be reframed is recognized across cultures and finds its most resonant English expression in Paul's single verse.
Cultural Usage
In medicine, the phrase appears in discussions of chronic conditions that patients must manage rather than cure. In organizational management, a persistent underperforming employee or structural inefficiency is routinely called a thorn in someone's side. The phrase's pastoral depth - its origin in a story about divine refusal to remove suffering and about grace discovered within limitation - gives it a weight that more clinical synonyms lack. Few English metaphors have been so thoroughly absorbed into secular life while retaining so much of their original theological texture.