After their initial meeting (2 days), Peter Drucker asked one thing of Jim Collins. Change your question from how to be successful to how to be useful.

“But I do have a request. That you change your question a little bit. It seems to me you spend a lot of time trying — worrying about if you’re going to survive. Well, you’ll probably survive. And you spend too much time thinking about if you’ll be successful. It’s the wrong question. The question is, “how to be useful?” And that was the last thing he said that day. He just got out of the car, and closed the door, and walked away.

Listen to Jim Collins tell the story on the Tim Ferris Podcast. Starts around 1hour 38minutes in.