Medieval theologians debated the nature of hell's fire — Hugh of St. Victor argued it is spiritual in substance yet forces the damned to witness companions in torment, intensifying their grief, while Aquinas leaned toward a corporeal fire that afflicts body and soul alike. Medieval sources also distinguished hell sharply from purgatory: hell is final and offers no purification, while purgatory cleanses venial sins over variable durations proportioned to their persistence. The Reformers and their heirs inherited the consensus on hell's eternity: Luther, Whitefield, and Ryle all insisted that Scripture's plain language of unquenchable fire and undying worm demands recognition of perpetual conscious punishment proportioned to the gravity of sin. The call to repentance runs throughout — hell's reality in church teaching has always been primarily pastoral in intent.
"That flame, the avenger of vices, has cremation and has not light... the evil are to see also with themselves their followers in the torment through love of whom they sinned, so that a view of those whose life they had loved carnally afflicts them with an increase of their own damnation" — Hugh on hell's flame as lightless yet illuminating, forcing the damned to witness companions in torment and turning past affections into compounded punishment.
"Since that which clings more persistently is more slowly cleansed, it follows that some are tormented in Purgatory longer than others, for as much as their affections were steeped in venial sins" — Aquinas distinguishing purgatory's remedial and variable duration from hell's finality, where no purification is possible and grave faults lead to unending torment without hope of relief.
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