It is wild to me that people consider Dale Carnegie and Tony Robbins in the same boat. "How to Win Friends and Influence People" by Dale Carnegie completely changed how I communicate with people, for the better.

For nerds (like me) who think data and statistics are the way to persuade people, you're doing yourself a disservice by ignoring the truth. Lots of people think sales are icky, but much of life is influenced by your ability to persuade and sell, even yourself, to others.