For instance, it was common for Jagr to leave his Upper West Side apartment in the evening and drive to the MSG Training Center in Greenburgh to hone his stick-handling and shooting skills after already having practiced with the team earlier in the day.

WSJ: Why Didn't the New York Rangers Keep Jaromir Jagr?

But it does get at the heart of what makes Buffett Buffett: an ability to hone in on a small core of fundamental principles and stick with them even when they are unpopular.

FORBES: 3 Key Takeaways from Buffett's Latest Letter