People who do not succeed have one distinguishing trait in common. They know all the reasons for failure, and have what they believe to be air-tight alibis to explain away their own lack of achievement.
A lot of people change for good. Some people just fall off. Just trying to progress in anything, no matter what you're doing, I feel like any progression you make... some people aren't gonna be around you that were around you.
You have to have the service mentality in the sense that you subjugate your own ego, and you subjugate a large part of your own life to really helping other people, being successful on their behalf.