Gnashing Of Teeth

Gnashing of teeth — the audible grinding of one tooth-set against another — is the outward gesture by which scripture marks two interior states: rage at the righteous, and the grief of frustrated desire. Outside those two registers it appears once more as the involuntary sign of bodily torment under unclean-spirit affliction, and it surfaces in the words of Jesus as the proverbial mark of those cast outside the kingdom.

Rage Against the Righteous

The earliest gnashing in the canon is laid on Job's adversary. Inside Job's lament the gesture is paired with tearing wrath and a sharpened predatory gaze: "He has torn me in his wrath, and persecuted me; He has gnashed on me with his teeth: My adversary sharpens his eyes on me" (Job 16:9). The teeth-gesture is registered as a beast-like animosity directed at the sufferer, and the on-me adverb fixes Job himself as the sole target.

The Psalter takes up the same figure. David lodges the gnashing inside a wicked-class, naming the gnashers as "godless fools" — a phrase that strips any piety-claim from the rage-actors: "Among the wicked, the godless fools Who gnashed on me with their teeth" (Ps 35:16). In the broader portrait of Psalm 37, the gnashing externalizes the wicked man's interior anti-just plotting: "The wicked plots against the just, And gnashes on him with his teeth" (Ps 37:12). The plot-verb and the gnash-verb sit side by side, the second giving body to the first.

At the fall of Jerusalem the same gesture is collectivized. The whole enemy-class opens its mouth, hisses, and grinds its teeth at the daughter of Zion, here standing in the righteous-target slot of the rage-against-the-righteous paradigm: "All your enemies have opened their mouth wide against you; They hiss and gnash the teeth; they say, We have swallowed [her] up; Certainly this is the day that we looked for; we have found, we have seen it" (La 2:16). The hiss-and-gnash pair is joined to a triumphant swallowing-claim and a satisfied long-anticipation, so the gnashing is graded here not as mere frustration but as the rage of victors registering their long-awaited witness of the city's fall.

The Grief of Frustrated Desire

A second register is opened in the acrostic-beatitude of Psalm 112. The wicked man does not gnash here at any direct injury — he gnashes at watching the Yahweh-fearer flourish: "The wicked will see it, and be grieved; He will gnash with his teeth, and melt away: The desire of the wicked will perish" (Ps 112:10). The see-grieve / gnash-melt / desire-perish three-beat stages the disappointment as witnessed flourishing of the righteous, an externalized teeth-on-teeth release paired with an internal melting, and a final extinction of want. What the wicked desired — presumably the same flourishing he sees the Yahweh-fearer receive — perishes in the seeing.

This disappointment-register is what Jesus picks up when describing the moment those outside the kingdom watch the patriarchs received inside it: "There will be the weeping and the gnashing of teeth, when you⁺ will see Abraham, and Isaac, and Jacob, and all the prophets, in the kingdom of God, and yourselves cast forth outside" (Lu 13:28). The seeing is again the trigger; the gnashing is again paired with another body-sign (here weeping rather than melting); and the loss is again positional — the cast-forth-outside register matching the desire-of-the-wicked-will-perish closing of the psalm.

Gnashing as Bodily Torment

A third use sits apart from the two rage-and-grief registers. In the gospel scene of the demoniac boy, the father describes the recurrent seizure: "wherever it takes him, it dashes him down: and he foams, and grinds his teeth, and becomes stiff: and I spoke to your disciples that they should cast it out; and they were not able" (Mr 9:18). Here the teeth-grinding is involuntary — the body's distress under a power it cannot throw off, listed alongside the dashing-down, the foaming, and the stiffness as part of one convulsive event. The same outward sign that elsewhere expresses the wicked's rage or grief is, in this scene, wrenched out of a child by an unclean spirit.

Related

The full body-imagery of the teeth — including the prayer that Yahweh break the teeth of the wicked, Job's plucking of prey from the predator's teeth, and the lament-speaker's own teeth crushed by gravel-stones — is treated in the broader Teeth page.