'[Gold] gets dug out of the ground in Africa, or someplace. Then we melt it down, dig another hole, bury it again and pay people to stand around guarding it. It has no utility. Anyone watching from Mars would be scratching their head.'

'If I wanted to, I could hire 10,000 people to do nothing but paint my picture every day for the rest of my life. And the gross national product would go up.'

'Chains of habit are too light to be felt until they are too heavy to be broken.'

'You only find out who is swimming naked when the tide goes out.'