Quotes about illusion
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“Life has no meaning, the moment you lose the illusion of being eternal.”
“The main trouble with being an honest man was that it lost you all your illusions.”
Source: From Here to Eternity
“An idyllic childhood is probably illusion.”
Source: The Lamorna Wink

Source: Reflections on War and Death
Source: Salt of the Air
Source: The Diamond Sutra

November, 1933
Diary entries (1914 - 1974)

“We're a government that believes in everybody having the illusion of free will.”
Source: The Wanting Seed

“The emotion of love gives all of us a misleading illusion of knowing the other.”

“The single biggest problem in communication is the illusion that it has taken place.”
The attribution to Shaw comes from Leadership Skills for Managers (2000) by Marlene Caroselli, p. 71. But this quote seems more likely to come from William H. Whyte. The Biggest Problem in Communication Is the Illusion That It Has Taken Place, Quote Investigator, 2014-08-31, 2015-11-09 http://quoteinvestigator.com/2014/08/31/illusion/,
Misattributed

“The causes of illusions are not pretty to discover. They're either vicious or tragic.”
Source: The Fountainhead

“Harry: Tradition is the illusion of permanence.”
Deconstructing Harry (1997)

Variant: I did not count the days or the weeks or the months. Time is an illusion that only makes us pant. I survived because I forgot even the very notion of time.
Source: Life of Pi

“I’m an idealist without illusions.”
Comment about JFK by Jacqueline Kennedy Onassis as quoted in the Audiobook Jacqueline Kennedy: Historic Conversations on Life with John F. Kennedy (December 27, 2011) by Caroline Kennedy (Author, Narrator), Michael Beschloss (Author, Narrator), Jacqueline Kennedy (Narrator) & Arthur M. Schlesinger, Jr. (Narrator) and published by Hyperion AudioBooks.
Attributed

“I just think it’s funny that he has a twin brother and he’s never used me in one of his illusions.”
(about Jonathan's career as an illusionist) Real Style staff, "Interview: Property Brothers Drew & Jonathan Scott On Women, Dating & The New Season" http://www.realstylenetwork.com/celebrities/2012/09/interview-property-brothers-drew-jonathan-scott-on-women-dating-the-new-season/. Real Style. Retrieved January 30, 2017.

Tales of Three Hemispheres http://www.gutenberg.net/dirs/1/1/4/4/11440/11440-8.txt, A Shop In Go-By Street
Tomasz Vetulani o Holandii, niskim kraju http://www.nto.pl/apps/pbcs.dll/article?AID=/20110605/REPORTAZ01/762330357, nto.pl, 5 June 2011 (in Polish)

Diary entry (April 30, 1870) as quoted in Ralph Barton Perry, The Thought and Character of William James, vol. 1, p. 323; Letters of William James, vol. I, p. 147.
1870s

Source: Memoirs of a Superfluous Man (1943), p. 304-305

p, 125
Geometrical Lectures (1735)

The Cosmic Philosophy, 1931

“Dragonfly” (p. 199)
Earthsea Books, Tales from Earthsea (2001)

"6th Foundational Falsehood of Creationism" https://www.youtube.com/watch?v=t3k0dDFxkhM, Youtube (February 2, 2008)
Youtube, Foundational Falsehoods of Creationism

Source: The Light of Day (1900), Ch. VII: The Modern Skeptic

Source: Images and Symbols (1952), p. 90 - 91.
What Men Still Don't Know About Transforming Their Relationships, pp. 194–198
What Men Still Don't Know About Women, Relationships, and Love (2007)
Source: From the Notebooks of Dr. Brain (2007), Chapter 1 “Operation: Cooperation!” (p. 31)

1990s, The Monarchy: A Critique of Britain's Favourite Fetish

translation from original Dutch: Fons Heijnsbroek
(original Dutch: citaat van Willem Roelofs, in het Nederlands:) Schepen, huizen, molens eb in één woord alles, wat door menschen gemaakt is, moet recht staan en met zorg geschilderd worden. Dit staat juist zeer goed tegenover andere, minder symmetrische dingen, als boomen, luchten enz. Het maakt het schilderij wel niet, maar draagt toch bij tot de illusie. 't Is er net mee, als met iemand, die keurig gekleed is, maar wiens das los zit. De ramen van een huis moeten recht, een molen zuiver van constructie zijn, de wieken in het perspectief staan.
Quote of Roelofs; as cited by H.F.W. Jeltes, in Willem Roelofs : bizonderheden betreffende zijn leven en zijn werk, met brieven en andere bijlagen, Van Kampen, Amsterdam, 1911, pp. 86-87
undated quotes
Broken Lights Letters 1951-59.
Source: Kierkegaard’s Critique of Reason and Society (1992), p. 49

John Cumming trans., p. 7.
Dialektik der Aufklärung [Dialectic of Enlightenment] (1944)
Source: Lady of Mazes (2005), Chapter 24 (p. 265).
Vol. 2, Essais et Notes
The Lie of the Truth (1938)

“Even though you were once a goddess, Kalidasa’s heaven was only an illusion.”
Source: The Fountains of Paradise (1979), Chapter 11 “The Silent Princess” (p. 67)
Source: The Nude: A Study in Ideal Form (1951), Ch. 1: The Naked and the Nude
Source: The Passionate Life (1983), p. 20

"On the Philosophy of the Asiatics" (1794)

Interview with 'Beneath' director Larry Fessenden https://www.axs.com/interview-with-beneath-director-larry-fessenden-92769 (March 25, 2014)
quote c. 1900, in: 'Lista,' by Balla; in catalogue raisonné, Edizione Galleria Fonte d'Abisso, Modena, 1982, p. 248
Balla's quote refers to a photo of a moving girl he saw, made before 1900 by photographer Jules-Etienne Marey; the photo was exposed at the Exposition Universelle (1900), visited by Balla, then.

“Free will is an illusion. It is synonymous with incomplete perception.”
Source: Flashforward (1999), Chapter 12 epigram (p. 123; quoting Walter Kubilius)

“The Dreams of Albert Moreland” (p. 182); originally published in The Acolyte, #10, Spring 1945
Short Fiction, Night's Black Agents (1947)

On her work All Men are Mortal in Force of Circumstances (1963), p. 73
General sources
Source: They'd Rather Be Right (1954), p. 187.

“Wedding Day”, Earthly Paradise (1966) ed. Robert Phelps

Source: Archetypal Dimensions of the Psyche (1994), The Anima as the Woman within the Man, p. 311

1970's, Conversations with Samuel Beckett and Bram van Velde (1970 - 1972)

Source: 1930s- 1950s, The End of Economic Man (1939), p. 246
“Illusion is the mantle of the Real”
Source: Echoes from the Bottomless Well (1985), p. 16

Icarus Ascending.
Song lyrics, Full Circle (2003)

Source: The Illusion of Free Markets: Punishment and the Myth of Natural Order (2011), p. 32

Letter to José Correia da Serra (1814) ME 14:224
Posthumous publications, On financial matters
“"Being" exists only as a neurological and linguistic illusion.”
Source: The Apophenion (2008), p. 18

Source: Short fiction, Thomas the Proclaimer (1972), Chapter 3, “The Sleep of Reason Produces Monsters” (p. 76)

" Rules of Language http://pinker.wjh.harvard.edu/articles/papers/Pinker%20Rules%20of%20Language.pdf," Science (August 2, 1991)

“Was not the arbitrary distinction between illusion and reality the ultimate illusion itself?”
Source: The Void Captain's Tale (1983), Chapter 13 (p. 164)

Source: The Image: A Guide to Pseudo-Events in America (1961), p. 261.

Patheos, A Letter to a Certain Christian http://www.patheos.com/blogs/reasonadvocates/2013/10/12/a-letter-to-a-certain-christian/ (October 12, 2013)

Source: The Image: A Guide to Pseudo-Events in America (1961), p. 44.

To see the snowman is to dislike the snowman. It doesn't look like a snowman, anyway.
Review http://www.rogerebert.com/reviews/jack-frost-1998 of Jack Frost (11 December 1998)
Reviews, One-star reviews

This "aphorism" was expressed in different forms by Josh Billings and Socrates. note: Often misquoted as, "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge," and often misattributed to Stephen Hawking.
Source: Cleopatra's Nose: Essays on the Unexpected (1995).

1960s, Where Do We Go from Here: Chaos or Community? (1967)
Source: Philosophy and Real Politics (2008), p. 11.