"Merely having an open mind is nothing. The object of opening the mind as of opening the mouth is to shut it again on something solid."
- G. K. Chesterton
"The perversion of the mind is only possible when those who should be heard in its defence are silent."
- Archibald MacLeish
"Our minds are lazier than our bodies."
- La Rochefoucauld
"Strength is a matter of the made-up mind."
- John Beecher
"What we think and feel and are is to a great extent determined by the state of our ductless glands and our viscera."
- Aldous Huxley
"The feeling of inferiority rules the mental life and can be clearly recognized as the sense of incompleteness and unfulfillment and in the uninterrupted struggle both of individuals and of humanity."
- Alfred Adler
"Discipline does not mean suppression and control nor is it adjustment to a pattern or ideology. It means a mind that sees 'what is' and learns from 'what was'."
- Jiddu Krishnamurti
"That which enters the mind through reason can be corrected. That which is admitted through faith hardly ever."
- Santiago Ramon y Cajal