The business author Stephen Covey explains it well using logging as an analogy – when you are trying to saw a tree down you must take breaks to sharpen your saw. Being a workaholic and failing to do so will leave you blunt and useless.

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Quote text and notes from Wikiquote: Nigel Cumberland (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.