"Why is self-compassion so powerful? In large part, because it is non-evaluative — in other words, your ego is effectively out of the picture — you can confront your flaws and foibles head on. You can get a realistic sense of your abilities and your actions, and figure out what needs to be done differently next time.
When your focus is instead on protecting your self-esteem, you can't afford to really look at yourself honestly. You can't acknowledge the need for improvement, because it means acknowledging weaknesses and shortcomings — threats to self-esteem that create feelings of anxiety and depression. How can you learn how to do things right when it's killing you to admit — even to yourself — that you've done them wrong?"