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

„Open your eyes, train your ears, use your head. If a mind you have, then use it while you can.“

—  Haruki Murakami, livre Hard-Boiled Wonderland and the End of the World

Source: Hard-Boiled Wonderland and the End of the World

„The highest privilege of being a writer is being able to say, "open your mind to me and I'll take you to another world."“

—  Alexei Maxim Russell Canadian writer 1976

from official website http://www.whynot-world.com

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

—  Groucho Marx American comedian 1890 - 1977

„Faith is a padlock of the mind, and few keys can open it.“

—  Jerry Coyne American biologist 1949

" Don McLeroy leaves creationist comment: evolution can’t explain “biochemical complexity” http://whyevolutionistrue.wordpress.com/2013/01/30/don-mcleroy-leaves-creationist-comment-evolution-cant-explain-biochemical-complexity/" January 30, 2013

„Here you discover that so long as books are kept open, then minds can never be closed.“

—  Ronald Reagan American politician, 40th president of the United States (in office from 1981 to 1989) 1911 - 2004

„You have to keep your mind as wide-open as your eyes, because almost nothing is what it seems.“

—  Jonathan Maberry, livre Rot & Ruin

Source: Rot & Ruin

„You need a mind open to possibility, conditioned to love the creative spirit we all have inside ourselves.“

—  Yanni Greek pianist, keyboardist, composer, and music producer 1954

„It is not enough to be in the right place at the right time. You should also have an open mind at the right time.“

—  Paul Erdős Hungarian mathematician and freelancer 1913 - 1996

My Brain Is Open : The Mathematical Journeys of Paul Erdos (1998) by Bruce Schechter, p. 99

„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

„Open your grief-stricken heart to the Lord. Weep and sincerely pray, 'O Lord, draw me towards You; give me peace of mind.' By doing so constantly you, will gradually attain peace of mind.“

—  Sarada Devi Hindu religious figure, spiritual consort of Ramakrishna 1853 - 1920

„By all means let's be open-minded, but not so open-minded that our brains drop out.“

—  Richard Dawkins English ethologist, evolutionary biologist and author 1941

The Enemies of Reason, "The Irrational Health Service" [1.02], 20 August 2007, timecode 00:13:05"ff"
The Enemies of Reason (August 2007)
Variante: We should be open-minded, but not so open-minded that our brain falls out.

„Travel opens your mind as few other things do.“

—  Libba Bray, livre Rebel Angels

Source: Rebel Angels

„It pays to keep an open mind, but not so open your brains fall out.“

—  Carl Sagan American astrophysicist, cosmologist, author and science educator 1934 - 1996

„A day will come when there will be no battlefields, but markets opening to commerce and minds opening to ideas.“

—  Victor Hugo French poet, novelist, and dramatist 1802 - 1885

Discours d'ouverture, congrès de la paix http://fr.wikisource.org/wiki/Congr%C3%A8s_de_la_Paix_1849, [Opening address, Peace Congress], Paris (21 August 1849); published in Actes et paroles - Avant l'exil (1875)
Contexte: A day will come when there will be no battlefields, but markets opening to commerce and minds opening to ideas. A day will come when the bullets and bombs are replaced by votes, by universal suffrage, by the venerable arbitration of a great supreme senate which will be to Europe what Parliament is to England, the Diet to Germany, and the Legislative Assembly to France.
A day will come when a cannon will be a museum-piece, as instruments of torture are today. And we will be amazed to think that these things once existed!
A day will come when we shall see those two immense groups, the United States of America and the United States of Europe, facing one another, stretching out their hands across the sea, exchanging their products, their arts, their works of genius, clearing up the globe, making deserts fruitful, ameliorating creation under the eyes of the Creator, and joining together, to reap the well-being of all, these two infinite forces, the fraternity of men and the power of God.

„This is serious, and you gotta keep your mind open in case an idea comes along—you want there to be some room for it to fit in.“

—  Orson Scott Card American science fiction novelist 1951

Source: The Tales of Alvin Maker, The Crystal City (2003), Chapter 5 “Crystal Ball” (p. 98).

„Smashing heads does not open minds.“

—  Deborah Tannen American sociolinguist 1945

„My mind is just as open as it ever was, professor. But it's a scientific mind, and there's no place in it for superstitions.“

—  Garrett Fort screenwriter 1900 - 1945

Skeptical of Von Helsing's story of vampires
Dracula's Daughter (1936)

„Art happens all the time, everywhere. All we have to do is to keep our minds open.“

—  Jacek Tylicki American artist 1951

Jacek Tylicki, in "Les Krantz," The New York Art Review, 1988.

„How many times… have you encountered the saying, 'When the student is ready, the Master speaks?' Do you know why that is true? The door opens. The Master is everywhere, but the student has to open his mind to hear the Masters Voice.“

—  Robert Anton Wilson, livre Masks of the Illuminati

Source: Masks of the Illuminati