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

— Hatake Kakashi
„Open your eyes, train your ears, use your head. If a mind you have, then use it while you can.“
— Haruki Murakami
„Be open minded, but not so open minded that your brains fall out.“
— Groucho Marx
„Here you discover that so long as books are kept open, then minds can never be closed.“
— Ronald Reagan
„It pays to keep an open mind, but not so open your brains fall out.“
— Carl Sagan