Most changes are caused by criticism. This is true because if you are doing something right, unless you think it must be changed for the better, you do nothing about it. Criticism helps a person realize their actual actions vs. what they believe their actions are.
People don’t like criticism because it is focus on their negative attributes. The way I see it, criticism is another persons view of you; likely a view that you fail to see because you are inside the box. One thinks himself to be good, and in so doing, fail to see their own actions. We fail to see ourselves as imperfect.
What's the different between criticism and constructive criticism?