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Thomas Edison: Restlessness is discontent — and discontent is the first necessity of progress…

Restlessness is discontent — and discontent is the first necessity of progress. Show me a thoroughly satisfied man — and I will show you a failure.
Thomas EdisonSourced
Source
From the book The Diary and Sundry Observations of Thomas Alva Edison (1948), The Diary and Sundry Observations of Thomas Alva Edison (1948), p. 110

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