„A mind is like a parachute. It doesn't work if it is not open.“

„An open mind is really a mark of foolishness, like an open mouth. Mouths and minds were made to shut; they were made to open only in order to shut.“

—  G. K. Chesterton English mystery novelist and Christian apologist 1874 - 1936

Original quote:
For my friend said that he opened his intellect as the sun opens the fans of a palm tree, opening for opening's sake, opening infinitely for ever. But I said that I opened my intellect as I opened my mouth, in order to shut it again on something solid. I was doing it at the moment. And as I truly pointed out, it would look uncommonly silly if I went on opening my mouth infinitely, for ever and ever.
The Extraordinary Cabman, one of many essays collected in Tremendous Trifles (1909)
Misattributed

„The mind is like an umbrella - it functions best when open.“

—  Walter Gropius German architect (1883-1969) and founder of the Bauhaus School 1883 - 1969

As quoted in The Art of Looking Sideways by w:Alan Fletcher, p. 129

„When God closes a door, he opens a window. Yeah. The problem was that this particular window opened off the tenth story, and he wasn't so sure God supplied parachutes.“

—  Diana Gabaldon American author 1952

Zdroj: An Echo in the Bone

„If we keep an open mind, too much is likely to fall into it.“

—  Natalie Clifford Barney writer and salonist 1876 - 1972

In "Samples from Almost Illegible Notebooks", ADAM International Review, No. 299 (1962)

„Communism doesn't work because people like to own stuff.“

—  Frank Zappa American musician, songwriter, composer, and record and film producer 1940 - 1993

„War is a bazaar where lives are traded like any other commodity: chocolate or bullets or parachute silk.“

—  Anthony Doerr, kniha All the Light We Cannot See

Zdroj: All the Light We Cannot See

„I like Islam, it is a consistent idea of religion and open-minded.“

—  Kurt Gödel logician, mathematician, and philosopher of mathematics 1906 - 1978

As quoted in A Logical Journey: From Gödel to Philosophy (1996) by Hao Wang

„I like to consider my mind an open door. It's just not a revolving door.“

—  J. Michael Straczynski American writer and television producer 1954

[ATTN JMS: Are you a millionaire ?, J. Michael Straczynski, 2002-07-20, rec.arts.sf.tv.babylon5.moderated, 20020720000422.11234.00000533@mb-fx.aol.com, http://groups.google.com/group/rec.arts.sf.tv.babylon5.moderated/msg/5d0fa989a5c65112]

„Life in the twentieth century is like a parachute jump: you have to get it right the first time.“

—  Margaret Mead American anthropologist 1901 - 1978

As quoted in Margaret Mead, World's Grandmother (1975) by Ann Morse, Charles Morse, Harold Henriksen, p. 9
1970s

„What the eye doesn't see and the mind doesn't know, doesn't exist.“

—  D.H. Lawrence, kniha Lady Chatterley's Lover

Zdroj: Lady Chatterley's Lover

„Be open minded, but not so open minded that your brains fall out.“

—  Groucho Marx American comedian 1890 - 1977

„It’s so insane the way rockets work today. It would be like if you got a plane and the way you get to your destination is you bail out with a parachute over the city in question and your plane crash lands somewhere. That’s how rockets work today—with the exception of Falcon 9. This is completely bonkers.“

—  Elon Musk South African-born American entrepreneur 1971

TIME Magazine, 12 July 2019, https://time.com/5628572/elon-musk-moon-landing/

„Me, I just don't care about proprietary software. It's not "evil" or "immoral," it just doesn't matter. I think that Open Source can do better, and I'm willing to put my money where my mouth is by working on Open Source, but it's not a crusade – it's just a superior way of working together and generating code.“

—  Linus Torvalds Finnish-American software engineer and hacker 1969

2000s, 2007

„Guns are like parachutes: if you don’t have one when you need it, then chances are that you won’t ever be in need of one again.“

—  James Wesley Rawles Survivalist-fiction author and blogger 1960

Zdroj: Tools For Survival (2009), p. 188

„Learning implies a mind that doesn't know.“

—  Jiddu Krishnamurti Indian spiritual philosopher 1895 - 1986

2nd Public Talk, Saanen, Switzerland (20 July 1971)
1970s

„You can not open the mind of another if you do not have an open mind yourselves.“

—  Hatake Kakashi, kniha Naruto

To Iruka

„What worked yesterday doesn't always work today.“

—  Elizabeth Gilbert, kniha Eat, Pray, Love

Zdroj: Eat, Pray, Love

„Are we, like, having a conversation?"
"Did you just, like, ask me for advice and listen with an open mind? If so, then yes, I would call this a conversation“

—  Karen Marie Moning author 1964

Zdroj: Shadowfever

„Both optimists and pessimists contribute to society. The optimist invents the aeroplane, the pessimist the parachute.“

—  George Bernard Shaw Irish playwright 1856 - 1950

Varianta: Both optimists and pessimists contribute to society. The optimist invents the aeroplane, the pessimist the parachute.