"A man convinced against his will Is of the same opinion still" ― Dale Carnegie Wisdom Self-improvement From Dale Carnegie Author Added on 1/31/2026 About Dale Carnegie American author and lecturer best known for How to Win Friends and Influence People. He developed influential training courses in public speaking and interpersonal communication. His work helped popularize modern self-improvement literature. Born: 1888-11-24 Died: 1955-11-01 View all quotes from Dale Carnegie
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