"The essence of wealth is the capacity to control the forces of nature, and the extent of wealth depends upon the level of technology and the ability to create new knowledge."

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Willpower is what separates us from the animals. It's the capacity to restrain our impulses, resist temptation - do what's right and good for us in the long run, not what we want to do right now. It's central, in fact, to civilisation.

— Roy Baumeister