A non-doer is very often a critic-that is, someone who sits back and watches doers, and then waxes philosophically about how the doers are doing. It's easy to be a critic, but being a doer requires effort, risk, and change.
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.
If your message to the universe is gimme, gimme, gimme, the universe's response back to that kind of mentality is exactly the same. The universe will say right back to you over and over again, gimme, gimme, gimme. If you shift that and you say to the universe, to the world, how may I serve? How may I serve? The universe's response back to you is how may I serve you? How may I serve you?