“You must not think of how much you have done but of how much more you can do.”
“Security depends not so much upon how much you have, as upon how much you can do without. ”
“You never know how much you can do, until you try to do more than you can.”
“You'd be amazed how much research you can get done when you have no life whatsoever.”
“It doesnt matter how much education you have or how much money you make, it's the way you think about money that determines how much you have.”
“You look at it and think "How much more black can it be?" and the answer is... none!”