The one trait that separates the best from the rest. Are you disciplined?

You will find that this applies to your marriage, your friendships, your workout routine, your eating habits — whatever it is. You need to be disciplined. You need to keep at it and have faith that you're working in the right direction, if you feel that is the right thing for you.

You really need to be committed. You need to invest deeply in understanding something better than the next person, better than your competitor.