"Our fatigue is often caused not by work, but by worry, frustration and resentment." ― Dale Carnegie Topic(s): Work Tags: caused, fatigue, often More From Dale Carnegie "Success is getting what you want. Happiness is wanting what you get." "The essence of all art is to have pleasure in giving pleasure." "Most of us have far more courage than we ever dreamed we possessed." More In Work "My work as an artist is completely separate from my work as a philanthropist."― Lady Gaga "The more that I can work in different mediums, the more I can grow, and learn from different actors and different types of actors and directors and different styles of acting and build a tool box."― Christina Ricci "Sometimes what works 40 years ago doesn’t work today."― Joel Osteen