There is no learning without having to pose a question. And a question requires doubt.
Source:From lecture 'What is and What Should be the Role of Scientific Culture in Modern Society,' given at the Galileo Symposium in Italy (1964); later published in 'The Pleasure of Finding Things Out: The Best Short Works of Richard P. Feynman' edited by Jeffrey Robbins (ed. MJF Books, 1999), Page 112
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