“Today the greatest single source of wealth is between your ears.”

“Your most unhappy customers are your greatest source of learning.”

“It seems to me that the natural world is the greatest source of excitement; the greatest source of visual beauty; the greatest source of intellectual interest. It is the greatest source of so much in life that makes life worth living.”

“Safety is something that happens between your ears, not something you hold in your hands.”

“Remember, though, your best weapon is between your ears and under your scalp—provided it’s loaded.”

“Obstacles, not products, are the source of creating wealth.”

“It turns out that, at social gatherings, as a source of entertainment, conviviality, and good fun, I rank somewhere between a sprig of parsley and a single ice-skate.”

“You don't want to become so open minded that the wind whistles between your ears.”

“Radio: it ties a million ears to a single mouth.”

“Self-sufficiency is the greatest of all wealth.”