The source is a self-help book, "How To Stop Worrying And Start Living", written by Dale Carnegie, which aims to help readers conquer worry and live happier, more fulfilling lives. It provides practical advice, tested formulas, and inspiring stories from real people who have overcome their anxieties. Carnegie uses humor and anecdotes to illustrate his points and emphasizes the importance of taking action, focusing on the present, and developing a positive mental attitude. He also explores the detrimental effects of worry on health and success, while highlighting the positive impact of keeping busy, accepting the inevitable, and learning to appreciate the good in life.

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