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The screams, that fourteenth night, continued until dawn. They were totally unlike any sounds in my experience. Impossible to believe they could be uttered and sustained by a human, yet they did not seem to be animal. I listened, there in the gloom, my hands balled into fists, and knew, suddenly, that one of two things must be true. Either someone or something was making these ghastly sounds, and Brother Christophorus was lying, or–I was going mad. Hearing-voices mad, climbing-walls and frothing mad. I’d have to find the answer: that I knew. And by myself.
–Charles Beaumont (THE HOWLING MAN)

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“And then she died. How? I do not know. I no longer know; but one evening she came home wet, for it was raining heavily, and the next day she coughed, and she coughed for about a week, and took to her bed. What happened I do not remember now, but doctors came, wrote and went away. Medicines were brought, and some women made her drink them. Her hands were hot, her forehead was burning, and her eyes bright and sad. When I spoke to her, she answered me, but I do not remember what we said. I have forgotten everything, everything, everything! She died, and I very well remember her slight, feeble sigh. The nurse said: ‘Ah! and I understood, I understood!’
–Henri René Albert Guy de Maupassant (Was It A Dream)

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Dim, dubious, bat-like creatures seemed to be flitting to and fro between one of the stone vats and the group that toiled like sculptors, clothing the bony foot with a reddish plasm which they applied and moulded like so much clay. Gaspard thought, but was not certain later, that this plasm, which gleamed as if with mingled blood and fire, was being brought from the rosy-litten vat in vessels borne by the claws of the shadowy flying creatures. None of them, however, approached the other vat, whose wannish light was momently enfeebled, as if it were dying down. –Clark Ashton Smith (The Colossus of Ylourgne)

HIS voice came to us again. He said, at first, that he saw nothing in the abyss below him. Then he gasped, swayed, and almost lost his balance. We could see the sweat standing out on his brow and neck, soaking his blue shirt. There were things in the abyss, he said in hoarse tones, great shapes that were like blobs of utter blackness, yet which he knew to be alive. From the central masses of their beings he could see them shoot forth incredibly long, filamentine tentacles. They moved themselves forward and backward — horizontally, but could not move vertically, it seemed. They were, he thought, nothing but living shadows.
Robert A.W. Lowndes (THE ABYSS)

“The trouble with him was that he was without imagination. He was quick and alert in the things of life, but only in the things, and not in the significances. Fifty degrees below zero meant eighty-odd degrees of frost. Such fact impressed him as being cold and uncomfortable, and that was all. It did not lead him to meditate upon his frailty as a creature of temperature, and upon man’s frailty in general, able only to live within certain narrow limits of heat and cold; and from there on it did not lead him to the conjectural field of immortality and man’s place in the universe.”
― Jack London (To Build a Fire)