However, it's important that your self-image be both positive and
realistic. Having a self-image that is unrealistic can be a drawback,
whether that self-image is negative OR positive. Sometimes having an
occasional negative thought or criticism about oneself can encourage
change, hard work, growth and success. Sometimes having too positive an
image of oneself can encourage complacency, underachievement, and
arrogance. Finding the balance between feeling positive about oneself
but having realistic goals is important.