I found the following quote via this site found via my referrers for another site. And the reason why I started to read was because someone I worked with gave me one of her books. I needed to find this although I am still working out how much I agree with the improved part. I don't think it's necessarily self aggressive to strive for self improvement but more in how that is interpreted and carried out.
"When people start to meditate or to work with any kind of spiritual discipline, they often think that somehow they're going to improve, which is a sort of subtle aggression against who they really are. ... But loving-kindness --- maitri --- toward ourselves doesn't mean getting rid of anything. Maitri means that we can still be crazy after all these years. We can still be angry after all these years. We can still be timid or jealous or full of feelings of unworthiness. The point is not to try to change ourselves. Meditation practice isn't about trying to throw ourselves away and become something better. It's about befriending who we are already. The ground of practice is you or me or whoever we are right now, just as we are. That's the ground, that's what we study, that's what we come to know with tremendous curiosity and interest." - Pem Chondron