Emanuel Swedenborg, Heaven and Hell — Chapter LIX, What Hell Fire Is…
“ Gnashing of teeth is the continual contention and combat of falsities with each other, consequently of those who are in falsities, joined with contempt of others, with enmity, mockery, ridicule, blaspheming; and these evils burst forth into lacerations of various kinds; since everyone fights for his own falsity and calls it truth. These contentions and combats are heard outside of these hells like the gnashings of teeth; and are also turned into gnashings of teeth when truths from heaven flow in among them. In these hells are all who have acknowledged nature and have denied the Divine. ”
