“Hark! hark! – What mean those yells – those cries?
His chain some furious madman breaks!
He comes! I see his glaring eyes!
Now! now! my dungeon bars he shakes.
Help! Help! He's gone! Oh! fearful woe,
Such screams to hear – such sights to see!
My brain! my brain!”

— Matthew Lewis (writer)

I know, I know
I am not mad, but soon shall be.
"The Captive"; cited from The Life and Correspondence of M. G. Lewis (London: Henry Colburn, 1839) vol. 1, pp. 239-40.

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Matthew Lewis (writer)11

English novelist and dramatist 1775–1818

Michelle Rowen (1971) Canadian writer

Source: Dark Kiss

“A strong nor'-wester's blowing, Bill!
Hark! don't ye hear it roar now?
Lord help 'em, how I pities them
Unhappy folks on shore now!”

William Pitt (ship-builder) English ship-builder

The Sailor's Consolation.

“I jumped out the Lincoln, left him stinkin', put his brains in the street, now you can see what he was just thinkin”

Big L (rapper) (1974–1999) American rapper

"Danger Zone", Lifestylez ov da Poor and Dangerous (1995)

“It may be true that I had dancing in my blood… I was a toddler when I danced deliriously with that street beggar. All called him a madman when he brought the house down with his frenetic dancing. Was he really mad? His unerring jatis (danced to rhythmic patterns) reverberate in my mind. Who knows which siddhapurusha (literally: “with all accomplishments”) he was? I can still see the gleam in his eye. If I am dance-mad now how could it be otherwise?… My first guru was a madman.”

Balasaraswati (1918–1984) Indian dancer

[Knight, Douglas M., Balasaraswati: Her Art and Life, http://books.google.com/books?id=Q3EsA2NooW4C, 15 June 2010, Wesleyan University Press, 978-0-8195-6906-6, 17-18]
Quote

“He is gone now. His shop is gone. Weld Square is gone.
His life has been wiped clean off the board.
But I wake in the night and I see his face and I hear his voice.”

Charles Reis Felix (1923–2017) American writer

Prologue
Through a Portagee Gate (2004)

“But hark! what shriek of death comes in the gale,
And in the distant ray what glimmering sail
Bends to the storm?—Now sinks the note of fear!
Ah? wretched mariners!—no more shall day
Unclose his cheering eye to light ye on your way!”

Ann Radcliffe book The Mysteries of Udolpho

The Mysteries of Udolpho, Shipwreck; reported in Hoyt's New Cyclopedia Of Practical Quotations (1922), p. 704.
Attributed

“When the Fox hears the Rabbit scream he comes a-runnin', but not to help.”

Thomas Harris The Silence of the Lambs

Source: The Silence of the Lambs

“My brother got his doctorate in 1938, I think. If he had gone to work in Germany after that, he would have been helping to make Hitler's dreams come true.”

Kurt Vonnegut (1922–2007) American writer

Speech at MIT (1985), referring to his brother Bernard Vonnegut, and the choices available to scientists and the intelligent, to serve humanity, or to betray it, as published in Fates Worse Than Death (1991), Ch. 12
Various interviews
Context: My brother got his doctorate in 1938, I think. If he had gone to work in Germany after that, he would have been helping to make Hitler's dreams come true. If he had gone to work in Italy, he would have been helping to make Mussolini's dreams come true. If he had gone to work in Japan, he would have been helping to make Tojo's dreams come true. If he had gone to work in the Soviet Union, he would have been helping to make Stalin's dreams come true. He went to work for a bottle manufacturer in Butler, Pennsylvania, instead. It can make quite a difference not just to you but to humanity: the sort of boss you choose, whose dreams you help come true.
Hitler dreamed of killing Jews, Gypsies, Slavs, homosexuals, Communists, Jehovah's Witnesses, mental defectives, believers in democracy, and so on, in industrial quantities. It would have remained only a dream if it hadn't been for chemists as well educated as my brother, who supplied Hitler's executioners with the cyanide gas known as Zyklon B. It would have remained only a dream if architects and engineers as capable as my father and grandfather hadn't designed extermination camps — the fences, the towers, the barracks, the railroad sidings, and the gas chambers and crematoria — for maximum ease of operation and efficiency.