What was Paul's thorn in the flesh?
The passage never names the thing that tormented Paul. He calls it a thorn in the flesh and a messenger of Satan, and the silence about what it actually was has left readers guessing ever since — while the reason it was given is stated twice over in a single verse.
The Silence Is on Purpose
One writer treats the missing detail as deliberate, not accidental. The point of the account lies elsewhere:
William KellyWhat the thorn in the flesh was in Paul's case is purposely left undetermined, even if one may gather more or less its nature; but its moral aim, its intended effect, cannot be doubted. Nor is this measure of reticence without a wise motive, for it is a general principle of divine dealing with a form suited to each person so dealt with.
If the thorn had been named, readers with a different affliction could have excused themselves from the lesson. As it stands, the case fits everyone.
The Clues Point to the Body
Commentators do gather clues, and they agree on the general direction: something physical that damaged Paul's standing as a speaker.
J. N. DarbyThis thorn in the flesh given to Paul in order that he should not exalt himself was something that rendered him contemptible in his preaching. (Galatians 4:13-14.) It was a counterpoise to the rapture with which he had been honoured. We may not necessarily have the identical thorn that Paul had; God will always send us the needed one.
Beyond that, the specific guesses differ. Some link it to his eyesight, some to his voice, some to the stoning he survived:
A J PollockMany have thought this referred to paralysis or stammering. Writing to the assembly at Galatia, he referred to his temptation, which was in his flesh, which the Galatians did not despise, nor reject him because of it. They received him as an angel of God, even as Christ Jesus, and that, if it were possible, they would in their zeal and love have plucked out their own eyes to have given to him. This seems to imply blindness.
A Stake, Not a Splinter
The English word "thorn" undersells the original. It also explains why guessing the diagnosis is beside the point:
F. B. HoleWe understand that the word "thorn" is hardly strong enough... The Greek word indicates a sharp stake. It was God's preventive discipline, and the exact form of it we do not know, and do not need to know. It was a "messenger of Satan," and yet it came permissively from the hand of God, on the top of all the trials that came upon him from the persecuting world and the defects and failures of the saints.
Satan's Messenger, God's Instrument
Two hands are at work on the same thorn, and the second one sets the limits of the first:
Morrish Bible DictionaryIt is remarkable that, notwithstanding the malignity of Satan, God uses him in the discipline of His saints, as in the case of Job, but allows the evil one to go only as far as He pleases... It is well to remember that Satan is morally a vanquished foe, for he is exposed; and that no Christian can be touched by him except as permitted and controlled by his God and Father in discipline for his good.
Why It Was Needed: The Danger After the Third Heaven
Paul had been caught up into paradise. The peril did not lie in the vision but in what came afterwards:
J. N. DarbyHe is not puffed up when he is there, because it is the presence of God, and nobody can be proud in the presence of God. Persons fancy that it makes people proud to be in the third heaven. Never! The danger is, when you get out of the third heaven, of the flesh being proud of having been there.
The same logic reaches past Paul to anyone entrusted with great truth:
Samuel RidoutHe is to learn that the only vessel out of which such glories can shine is a broken vessel... And there is great danger lest the precious truths appropriate to us as men in Christ may simply feed our natural pride.
The Prayer That Was Answered by Something Better
Paul asked three times for removal and was refused. Notice what he had never asked to be spared:
J T MawsonAs we read in this Epistle what Paul suffered for Christ's sake, we wonder that mortal man could have survived it; yet we never hear of him praying for relief from those sufferings... "My grace" and "you." How those words throb with the tenderness of a perfect love. And consider them: the Lord at one end of the sentence and Paul at the other, and an all-sufficient grace between. The ocean and the thimble, and the ocean enough for the thimble!
The outcome turned the attack back on the attacker:
James BoydThree times he goes to the Lord about this thorn, but the answer of the Lord to him leaves no doubt on his mind that, in sending this messenger to buffet him, Satan had overreached himself, and had made Paul a more valuable servant than ever.
Summary
- Unnamed — the thorn's identity is withheld on purpose; its moral aim is what cannot be doubted.
- Bodily — the clues point to a physical affliction that made Paul contemptible as a preacher; commentators differ on whether it was his eyes, his speech, or something else.
- Permitted — it was Satan's messenger, yet given from God's hand; the enemy could go only as far as God allowed.
- Preventive — not punishment for failure but a guard against pride after unequalled revelations, since only a broken vessel can let the glory shine.
- Sufficient — three prayers brought no removal but a better answer: grace enough, power perfected in weakness, and a servant more useful than before.