Seeing energy as it flows is an imperious need on the path of knowledge. Ultimately, all the effort of sorcerers is guided to that end. It is not enough for a warrior to know that the universe is energy; he has to verify it for himself.
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.
We are in a survival mentality, and that's hard-wired into our humanity, because we are the winners of an evolutionary struggle of millions and millions and millions of years.