By the Lord’s arrangement and through mutual love, heaven forms a single human being with a single animating soul, so it looks toward a single goal: the preservation and salvation of all to eternity. In contrast, hell, out of its sense of autonomy and through self-love and materialism—through hatred, in other words—forms a single devil with a single animus, so it looks toward a single goal: the destruction and damnation of all to eternity. Thousands and thousands of times have I experienced the whole effort of hell as turning in this direction. If the Lord, then, did not preserve us all, every single solitary moment, we would be snuffed out.
However, the Lord forms and organizes hell in such a way that the bonds and restraints of people’s own desires and fantasies hold them fast. Their whole life consists in those desires and fantasies, and because their life is a living death, it turns into tortures so dreadful that they cannot be described.
The most intense pleasure of their life is to punish, torment, and inflict pain on each other. They use methods utterly unknown in the world. By these methods they know how to trigger acute sensations, exactly as though their victims were still in the body. They also know how to produce appalling, terrifying hallucinations, not to mention many other kinds of frights and terrors. The Devil’s crew takes such passionate delight in doing this that if they could increase and intensify the pain and anguish infinitely, they still would not rest satisfied; they would burn to add another infinity of grief. But the Lord negates their efforts and softens their abuse.
from Secrets of Heaven, Volume 1, Sections 694-695