Dale Harbison Carnegie [originally Carnagey until 1919] (November 24, 1888 – November 1, 1955) was an American writer, lecturer and the developer of famous courses in self-improvement, salesmanship, corporate training, public speaking and interpersonal skills. Born in poverty on a farm in Missouri, he was the author of How to Win Friends and Influence People, first published in 1936, a massive bestseller that remains popular today. He also wrote a biography of Abraham Lincoln, entitled Lincoln the Unknown, as well as several other books.
Thank your opponents sincerely for their interest. Anyone who takes the time to disagree with you is interested in the same things you are. Think of them as people who really want to help you, and you may turn your opponents into friends.
to be genuinely interested in other people is a most important quality for a sales-person to possess — for any person, for that matter.
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Let me repeat that. You can make more friends in two months by becoming interested in other people than you can in two years by trying to get other people interested in you.