9:41-50 It is repeatedly said of the wicked, Their worm dieth not, as well as, The fire is never quenched. Doubtless, remorse of conscience and keen self-reflection are this never-dying worm. Surely it is beyond compare better to undergo all possible pain, hardship, and self-denial here, and to be happy for ever hereafter, than to enjoy all kinds of worldly pleasure for a season, and to be miserable for ever. Like the sacrifices, we must be salted with salt; our corrupt affections must be subdued and mortified by the Holy Spirit. Those that have the salt of grace, must show they have a living principle of grace in their hearts, which works out corrupt dispositions in the soul that would offend God, or our own consciences.

48. Where their worm dieth not, and the fire is not quenched—See on [1468]Mt 5:30; The "unquenchablesness" of this fire has already been brought before us (see on [1469]Mt 3:12); and the awfully vivid idea of an undying worm, everlastingly consuming an unconsumable body, is taken from the closing words of the evangelical prophet (Isa 66:24), which seem to have furnished the later Jewish Church with its current phraseology on the subject of future punishment (see Lightfoot).