Self-improvement (n.) is a dangerous form of vanity.
Self-improvement (n.) concerns only the abstract image of ourselves, and following it makes that image ever more real; the true self is already Buddha.
Self-improvement (n.) aimed at the ego is like trying not to think of a monkey while taking your medicine.
Self-improvement (n.) needs a good "I" to work on a bad "me" — and the tussle only deepens the split that made "me" misbehave.
Self-improvement (n.) is split-mindedness that postpones freedom: trying to eat your mouth instead of bread.
Self-improvement (n.) has its place, but its limits are small beside the vast parts of our nature that stay the same.
Self-improvement (n.) by forceful means only makes trouble — for oneself and the world alike.