Quotes about madness
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Les objets extérieurs ont une action réelle sur le cerveau. Qui s’enferme entre quatre murs finit par perdre la faculté d’associer les idées et les mots. Que de prisonniers cellulaires devenus imbéciles, sinon fous, par le défaut d’exercice des facultés pensantes.
Source: Journey to the Center of the Earth (1864), Ch. XXVI: The worst peril of all

As quoted in A Beautiful Mind, (2001); also cited in Quantum Phaith (2011), by Jeffrey Strickland, p. 197
2000s

Georgina Howell, The Demanding Nastassia Kinski http://news.google.com/newspapers?nid=1309&dat=19860102&id=MQROAAAAIBAJ&sjid=MJwDAAAAIBAJ&pg=6682,494045, New Straits Times, January 2, 1986

The Last Messiah [Den sidste Messias] (1933)

Apparent Failure, vii.
Bartlett's Familiar Quotations, 10th ed. (1919)

Statement of 1996, as quoted in Dr. Riemann's Zeros (2003) by Karl Sabbagh, p. 88
1990s

The Cup, Act i, Scene 3, reported in Bartlett's Familiar Quotations, 10th ed. (1919)

“You're only given a little spark of madness and if you lose that, you're nothing.”
A Night at the Roxy (1978)

Letter to Christian Northoff (1497), as translated in Collected Works of Erasmus (1974), p. 114

"The Tomb" - Written Jun 1917; first published in The Vagrant, No. 14 (March 1922)<!-- p. 50-64 -->
Fiction
Context: In relating the circumstances which have led to my confinement within this refuge for the demented, I am aware that my present position will create a natural doubt of the authenticity of my narrative. It is an unfortunate fact that the bulk of humanity is too limited in its mental vision to weigh with patience and intelligence those isolated phenomena, seen and felt only by a psychologically sensitive few, which lie outside its common experience. Men of broader intellect know that there is no sharp distinction betwixt the real and the unreal; that all things appear as they do only by virtue of the delicate individual physical and mental media through which we are made conscious of them; but the prosaic materialism of the majority condemns as madness the flashes of super-sight which penetrate the common veil of obvious empiricism.

"I create gods all the time - now I think one might exist" (2008)
Context: Belief was never mentioned at home, but right actions were taught by daily example.
Possibly because of this, I have never disliked religion. I think it has some purpose in our evolution.
I don't have much truck with the "religion is the cause of most of our wars" school of thought because that is manifestly done by mad, manipulative and power-hungry men who cloak their ambition in God.
I number believers of all sorts among my friends. Some of them are praying for me. I'm happy they wish to do this, I really am, but I think science may be a better bet.

1961, UN speech
Context: Today, every inhabitant of this planet must contemplate the day when this planet may no longer be habitable. Every man, woman and child lives under a nuclear sword of Damocles, hanging by the slenderest of threads, capable of being cut at any moment by accident, or miscalculation, or by madness. The weapons of war must be abolished before they abolish us.

Light (1919), Ch. XVI - De Profundis Clamavi
Context: All is madness. And there is no one who will dare to rise and say that all is not madness, and that the future does not so appear — as fatal and unchangeable as a memory.
But how many men will there be who will dare, in face of the universal deluge which will be at the end as it was in the beginning, to get up and cry "No!" who will pronounce the terrible and irrefutable issue: —
"No! The interests of the people and the interests of all their present overlords are not the same.

“Let us speak of our madness. We are always being called mad.”
Yea and Nay : A series of lectures and counter-lectures given at the London school of economics in aid of the hospitals of London (1923) edited by C David Stelling, Section IV, Poetry and Modern Poetry
Context: Let us speak of our madness. We are always being called mad. If we are mad — we and our brothers in America who are walking hand in hand with us in the vanguard of progress — at least we are mad in company with most of our great predecessors and all the most intelligent foreigners. Beethoven, Schumann, and Wagner, Shelley, Blake, Keats, Coleridge, Wordsworth were all mad in turn. We shall be proud to join them in the Asylum to which they are now consigned.

As quoted in Martin Luther: The Man Who Rediscovered God and Changed the World (2017) by By Eric Metaxas, p. 85

“I love you all; I love you more than life itself, but you're all fucking mad!”
The Osbournes television show.
Original: (la) Μundo morere, ejus insaniam rejiciens: vive Deo, per ipsius cognitionem, veterem generationem repudians. Νοn facti sumus ut moreremur, sed nostra culpa morimur. Perdidit nos libera voluntas: servi facti sumus, qui liberi eramus: per peccatum venditi sumus. Νihil mali factum est a Deo: nos ipsi improbitatem produximus. Εam vero qui produxerunt, denuo repudiare possunt.
Source: Address to the Greeks, Chapter XI, as translated by J. E. Ryland
Original: (la) Regnare nolo: ditescere non libet: prae turam recuso, scortationem odi: navigare ob insatiabilem avaritiam non cupio: de coronis consequendis non dimico: liber sum ab insana gloria cupiditate: mortem contemno: guovis morbi genere superior sum: maror animum non peredit.
Source: Address to the Greeks, Chapter XI, as translated by J. E. Ryland

Source: May 12, 2019 The Tiananmen Massacre, 30 years on – Survivor Q&A: Zhou Fengsuo https://hongkongfp.com/2019/05/12/tiananmen-massacre-30-years-survivor-qa-zhou-fengsuo/

Original: (de) "Glaubt mir, des Menschen wahrster Wahn
wird ihm im Traume aufgetan:
all' Dichtkunst und Poeterei
ist nichts als Wahrtraumdeuterei."
Source: Quotes from his operas, Die Meistersinger von Nürnberg, Hans Sachs, Act 3, Scene 2

Genius is a form of madness and we're all that way. But I used to be coy about it, like me guitar playing. But if there's such a thing as genius — I am one. And if there isn't, I don't care.
John Lennon interview with Rolling Stone magazine (December 1970)

As quoted by George P. Thayer in The Further Shores of Politics: The American Political Fringe Today, 2d ed. (New York: Simon and Schuster, 1968), p. 27.
undated

Saying 25, Page 6
From Apophthegmata Patrum
“It's a lot easier to be crazy or mad than to just get on with living.”
Source: The Year of Secret Assignments
Source: Burn for Me

Source: Doktor Sleepless, Volume 1: Engines of Desire

“The language of psychiatry is a monologue of reason about madness”
Preface to 1961 edition
History of Madness (1961)
Context: The constitution of madness as mental illness, at the end of the eighteenth century, bears witness to a rupture in a dialogue, gives the separation as already enacted, and expels from the memory all those imperfect words, of no fixed syntax, spoken falteringly, in which the exchange between madness and reason was carried out. The language of psychiatry, which is a monologue by reason about madness, could only have come into existence in such a silence.

“Men were always quick to believe in the madness of women.”
Source: Eona: The Last Dragoneye

“Don't ever call me mad, Mycroft. I'm not mad. I'm just… well,, that's all.”
Source: The Eyre Affair

“The process of writing is a little like madness, a kind of possession not altogether benign.”
Source: Blackberry Wine

“Even the company of the mad was better than the company of the dead.”
Source: The Stand

“Sometimes it’s only madness that makes us what we are.”
Source: Batman: Arkham Asylum - A Serious House on Serious Earth

“You mean to say he became mad deliberately?'
… Nothing is more likely,' said the duke.”
Source: Jonathan Strange & Mr Norrell

“For me, the first sign of oncoming madness is that I'm unable to write.”
Source: Madness: A Bipolar Life

“There is no folly of the beast of the earth which is not infinitely outdone by the madness of man.”
Variant: for there is no folly of the beast of the earth which is not infinitely outdone by the madness of men
Source: Moby-Dick or, The Whale

“Reading made Don Quixote a gentleman. Believing what he read made him mad.”

The final lines of the poem.
The Waste Land (1922)
Source: The Waste Land and Other Poems

“Oh! how near are genius and madness! Men imprison them and chain them, or raise statues to them.”

“It is possible to be truly mad and to still exist upon scraps of life.”
Source: Betting on the Muse: Poems and Stories
“Eccentricty had flowered into madness.”
Source: The Beekeeper's Apprentice

“Sanity is a madness put to good uses.”
Source: The Essential Santayana: Selected Writings

Source: The Ultimate Hitchhiker's Guide to the Galaxy
“Growth for the sake of growth is a cancerous madness.”
"Water", p. 114
Desert Solitaire (1968)
Source: The Journey Home: Some Words in Defense of the American West

“Everybody's youth is a dream, a form of chemical madness.'
'How pleasant then to be insane!”
Variant: Youth is a dream, a form of chemical madness.
Source: The Diamond as Big as the Ritz, and Other Stories

“It is not the one thing nor the other that leads to madness, but the space in between them.”
Variant: It's not the one thing nor the other that leads to madness, but the space in between.
Source: Oranges Are Not the Only Fruit