“Happiness is found in doing, not merely possessing.”

“When defeat comes, accept it as a signal that your plans are not sound, rebuild those plans, and set sail once more toward your coveted goal.”

“A quitter never wins-and-a winner never quits.”

“The starting point of all achievement is DESIRE. Keep this constantly in mind. Weak desire brings weak results, just as a small fire makes a small amount of heat.”

“Whatever the mind can conceive and believe, it can achieve.”

“Do not wait: the time will never be 'just right'. Start where you stand, and work whatever tools you may have at your command and better tools will be found as you go along.”

“No man needs sympathy because he has to work, because he has a burden to carry. Far and away the best prize that life offers is the chance to work hard at work worth doing.”

“All my life I've been surrounded by people who are smarter than I am, but I found I could always keep up by working hard.”

“Loveless work, boring work, work valued only because others haven't got even that much, however loveless and boring--this is one of the harshest human miseries.”

“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.”