Iron rusts from disuse; stagnant water loses its purity and in cold weather becomes frozen; even so does inaction sap the vigor of the mind.
Leonardo da Vinci · The Notebooks, I, 2
Leonardo da Vinci · The Notebooks, I, 2
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More Motivational Quotes

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Theodore Roosevelt · In his autobiography Roosevelt credits the line to Squire Bill Widener of Widener's Valley, Virginia; it is usually quoted as "with what you have".

Winston Churchill · City Square, Amsterdam, 9 May 1948
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