We must not make a false faith by hiding from our thoughts the causes of doubt, for faith is the highest achievement of the human intellect, the only gift man can make to God, and therefore it must be offered in sincerity.
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.