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  5. Our fatigue is often caused not by work, but by worry,...

Our fatigue is often caused not by work, but by worry, frustration and resentment.

Dale Carnegie
Success, Fear, Not Giving Up
Dale Carnegie (2004). “How to Stop Worrying and Start Living”, p.219, Simon and Schuster
Our fatigue is often caused not by work, but by worry, frustration and resentment.