I think the point is that if you focus too much on the reward, you lose focus on helping the person. It's not that it's bad to (want to) be rewarded for good d

I think the point is that if you focus too much on the reward, you lose focus on helping the person. It's not that it's bad to (want to) be rewarded for good deeds, it's bad when you end up making things worse because of it. By some views every action you take is motivated by some psychological reward, and if you follow that through you end up with a view that there's no good/bad/emotion/etc and everything is purely mechanical.