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.
Do you know the most important trait a man can have? It is not executive ability; it is not a great mentality; it is not kindliness, nor courage, nor a sense of humor, though each of these is of tremendous importance. In my opinion, it is the ability to make friends, which, boiled down, means the ability to see the best in man.