I used to think that I can change the world but no one can change me. Then after few years of experience I learned that the reverse is actually right. I cannot change the world but I can change myself. And I found it worth rewarding too!
The changed me is with me every moment of my life, giving benefits of the changes I brought in myself.
While all those to whom I mentored and guided to change to their best are not giving me single penny! However they try to find fault in me to release themselves from the pressure of being mentored by me.

So changing other is really heavy on us but worst rewarded thing. So this is how I stopped changing anyone, I enjoy their uniqueness.