A mentally healthy person can experience his own existence value, not only know himself, but also accept himself, and have self-knowledge, that is, he can make an appropriate and objective evaluation of his own ability, personality, advantages and disadvantages; Don't put forward harsh and unreasonable expectations and requirements for yourself; You can also set realistic goals and ideals for your life, so that you are always satisfied with yourself; At the same time, strive to develop their own potential, even if their own defects can not be remedied, they can be handled safely. An unhealthy person lacks self-knowledge and is always dissatisfied with himself; Because the set goals and ideals are unrealistic, the distance between subjective and objective is too far, and they always blame themselves, blame themselves and feel inferior.