There are people who nurse a murderous hatred and therefore meditate revenge, seeking nothing short of their victim’s death and not resting until they have achieved it. Spirits like this are kept in a deep, cadaverous hell—one that reeks with a stench like that given off by corpses. Strange to say, the people there enjoy the stench so much that they prefer it to the most pleasant smells; such is their horrendous nature and the crazy thinking it spawns. The odor described actually wafts from that hell. When the place yawns open—as it rarely does, and then just briefly—so foul a smell pours out that spirits cannot stay in the vicinity.
Some demons, or rather avenging furies, were let out of that hell in order for me to discover what they were like. They infected the air with such poisonous and pestilential fumes that the spirits around me could not remain. At the same time they affected my stomach in such a way that I threw up.
They presented themselves in the form of a young child with a tolerably attractive face and a concealed dagger, whom they sent to me with a flask in hand. From this I learned that they had a taste for murder, either by dagger or poison, under the guise of innocence. The bodies of the spirits themselves were naked and quite black.
Soon, though, they were sent back into their cadaverous-smelling hell, and then I was able to watch the path of their descent. They headed to the left, keeping level with my left temple and going quite a distance without moving downward. Later they did descend, traveling first into a fire that appeared, then into a cloud of fiery smoke like that from a furnace, and directly afterward to a point below the furnace and in front, where many dark and gloomy caves led farther down. Along the way, they were constantly devising evil plots and schemes. Their intended victims were primarily the innocent, whom they targeted without cause. While passing through the fire, they wailed loud and long.
When released from their hell, they take with them a kind of ring that allows others to identify where they come from and what they are like. The ring is set with spikes which are made of something like bronze and which they grip tightly and twist with their hands—a sign that they are this type of spirit and that they are under restraint.
from Secrets of Heaven, Volume 1, Section 814