Summa Theologica Suppl, q. 97: Of the Punishment of the Damned
Article 2. Whether the worm of the damned is corporeal?
Objection 1It would seem that the worm by which the damned are tormented is corporeal. Because flesh cannot be tormented by a spiritual worm. Now the flesh of the damned will be tormented by a worm: "He will give fire and worms into their flesh" (Judith 16:21), and: "The vengeance on the flesh of the ungodly is fire and worms" (Ecclus. 7:19). Therefore that worm will be corporeal.
Objection 2Further, Augustine says (De Civ. Dei xxi, 9): . . . "Both, namely fire and worm, will be the punishment of the body." Therefore, etc.
On the contraryAugustine says (De Civ. Dei xx, 22): "The unquenchable fire and the restless worm in the punishment of the damned are explained in various ways by different persons. Some refer both to the body, some, both to the soul: others refer the fire, in the literal sense, to the body, the worm to the soul metaphorically: and this seems the more probable."
I answer thatAfter the day of judgment, no animal or mixed body will remain in the renewed world except only the body of man, because the former are not directed to incorruption [*Cf. Q[91], A[5]], nor after that time will there be generation or corruption. Consequently the worm ascribed to the damned must be understood to be not of a corporeal but of a spiritual nature: and this is the remorse of conscience, which is called a worm because it originates from the corruption of sin, and torments the soul, as a corporeal worm born of corruption torments by gnawing.
Reply to Objection 1The very souls of the damned are called their flesh for as much as they were subject to the flesh. Or we may reply that the flesh will be tormented by the spiritual worm, according as the afflictions of the soul overflow into the body, both here and hereafter.
Reply to Objection 2Augustine speaks by way of comparison. For he does not wish to assert absolutely that this worm is material, but that it is better to say that both are to be understood materially, than that both should be understood only in a spiritual sense: for then the damned would suffer no bodily pain. This is clear to anyone that examines the context of his words in this passage.
Article 3. Whether the weeping of the damned will be corporeal?
Objection 1It would seem that the weeping of the damned will be corporeal. For a gloss on Lk. 13:28, "There will be weeping," says that "the weeping with which our Lord threatens the wicked is a proof of the resurrection of the body." But this would not be the case if that weeping were merely spiritual. Therefore, etc.
Objection 2Further, the pain of the punishment corresponds to the pleasure of the sin, according to Apoc. 18:7: "As much as she hath glorified herself and lived in delicacies, so much torment and sorrow give ye to her." Now sinners had internal and external pleasure in their sin. Therefore they will also have external weeping.
On the contraryCorporeal weeping results from dissolving into tears. Now there cannot be a continual dissolution from the bodies of the damned, since nothing is restored to them by food; for everything finite is consumed if something be continually taken from it. Therefore the weeping of the damned will not be corporeal.
I answer thatTwo things are to be observed in corporeal weeping. One is the resolution of tears: and as to this corporeal weeping cannot be in the damned, since after the day of judgment, the movement of the first movable being being at an end, there will be neither generation, nor corruption, nor bodily alteration: and in the resolution of tears that humor needs to be generated which is shed forth in the shape of tears. Wherefore in this respect it will be impossible for corporeal weeping to be in the damned. The other thing to be observed in corporeal weeping is a certain commotion and disturbance of the head and eyes, and in this respect weeping will be possible in the damned after the resurrection: for the bodies of the damned will be tormented not only from without, but also from within, according as the body is affected at the instance of the soul's passion towards good or evil. In this sense weeping is a proof of the body's resurrection, and corresponds to the pleasure of sin, experienced by both soul and body.
This suffices for the Replies to the Objections.