“Know yourself. Be authentic. Have courage.”

“Reality is only as true as it is perceived. Reality does not change. How it is perceived does.”

“The questions you don't ask are just as important as you do. The questions you ask show what you understand, and ones you don't show what you know.”

“Words are free, action is not.”

“There is no better satisfaction than to see your children make your dreams theirs, and achieve them on their terms.”

“Live in the present. It won't last too long.”

“There is no better satisfaction than to see your children make your dreams theirs, and achieve them on their terms.”

“The foolishness of youth with the cynicism of age is a dangerous combination.”

“The land of easy mathematics where he who works adds up and he who retires subtracts.”

“At the age of 45, most days in Tucson were spent feeling like I was on the summit of Mauna Kea, as I was exhibiting debilitating health symptoms that corresponded to what I saw at very high altitud...”

“The hour is only long thus, if you've waited.”

“IQ's are a combination of eyes, and queues. Would you wait in line to see my goat show? Of course you wouldn't, because the line is invisible.”

“He couldn't tell that this was one of those occasions a man never forgets: a small cicatrice had been made on the memory, a wound that would ache whenever certain things combined - the taste of gin...”