"Eating, bathing, going to the toilet, talking, thinking, and many other activities related to the body are all work. How is it that the performance of one particular act is alone (considered) work? To be still is to be always engaged in work. To be silent is to be always talking."

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Inventive genius requires pleasurable mental activity as a condition for its vigorous exercise. "Necessity is the mother of invention" is a silly proverb. "Necessity is the mother of futile dodges" is much closer to the truth. The basis of growth of modern invention is science, and science is almost wholly the outgrowth of pleasurable intellectual curiosity.

— Alfred North Whitehead