For me that tipping point was when I came across this:
>The one book we encourage startup founders to read is Dale Carnegie's How to Win Friends and Influence People. It's critically important for anyone in business.
Yeah, the book is impressive. It will teach you how to become likeable by most people, and that is something you definitely need if you want to become a manager or any kind of leader, or just if you have to deal with people on your job, even if it's just your boss and coworkers.