"The most important thing in communication is hearing what isn't said."
"Every three or four years I pick a new subject. It may be Japanese art; it may be economics. Three years of study are by no means enough to master a subject but they are enough to understand it. SO for more than 60 years I have kept studying one subject at a time."
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Source: Peter Drucker (2014). “Innovation and Entrepreneurship”, p.41, Routledge
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