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Daughter, words could never describe the suffering of these wretched little souls. There are three principal vices: The first is selfishness, which in turn gives birth to the second, self-conceit. From this conceit comes the third, pride, with treacherous injustice and cruelty as well as other evil filthy sins generated by these. So also, I tell you, in hell there are four principal torments, and all the others are offspring of these. The first is that these souls are deprived of seeing me. This is so painful for them that if they could they would choose the sight of me along with the fire and excruciating torments, rather than freedom from their pains without seeing me. The first suffering revives the worm of conscience, and this is their second torment. For when they see that their sinfulness has deprived them of me and of the company of the angels and made them worthy instead of seeing the demons and sharing their fellowship, conscience gnaws away at them constantly. The sight of the devil is the third suffering, and it doubles every other torment… The fourth torment is fire. This fire burns without consuming, for the soul cannot be consumed, since it is not material (such as fire could consume) but spiritual.”
-St. Catherine of Siena relaying the words of God from a vision