That's right! I always double check my motivation why i'm doing something and if i find a little voice somewhere in my brain that says "maybe you get something for it" - either i don't do it or i look at other motivations to do it without my ego involved. I think that keeps me healthy and i feel the real joy IF i get something in return. And for example helping other people without expecting something in return your reward is your peace in your soul and knowing to do the right thing.