Dale Carnegie's self-help book "How to Win Friends and Influence People" remains a timeless classic in the digital age due to its fundamental integrity, underlying two core insights that every sales and marketing professional should internalize: developing empathy for others by understanding their self-interest and focusing on sincerity in genuine regard. The book's principles, including 30 sections on handling people, making them like you, winning them over, and being an effective leader, are rooted in Carnegie's observations of human nature and offer a formula for achieving success through virtuous principles and upstanding advice. By incorporating these principles into their strategy, sales and marketing professionals can cultivate a genuine connection with others, show appreciation rather than offering criticism, and ultimately find success through rigorous selflessness.