"The biggest lesson I have learned is the stupendous importance of what we think. If I knew what you think, I would know what you are, for your thoughts make you what you are; by changing our thoughts, we can change our lives."

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Source: Dale Carnegie (2012). “The Leader In You”, p.125, Simon and Schuster

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Dale Carnegie

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Dale Carnegie was a pioneering author and lecturer known for his work on personal development and effective communication, particularly through 'How to Win Friends and Influence People.'

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