Dale Harbison Carnegie (November 24, 1888 – November 1, 1955) was an American writer and lecturer and the developer of famous courses in self-improvement, salesmanship, corporate training, public speaking, and interpersonal skills. One of the core ideas in his books is that it is possible to change other people's behavior by changing one's behavior toward them.
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People rarely succeed unless they have fun in what they are doing.
If only the people who worry about their liabilities would think about the riches they do possess they would stop worrying.
Our fatigue is often caused not by work but by worry frustration and resentment.
The successful man will profit from his mistakes and try again in a different way.
Do the thing you fear to do and keep on doing it... that is the quickest and surest way ever yet discovered to conquer fear.
The essence of all art is to have pleasure in giving pleasure.
You never achieve success unless you like what you are doing.