To improve cognition, we need to keep learning, constantly understand the changing world and increase our talents, so as to understand this change and win more worlds. The level of mental health needs to know one's mental health. If mental health is not perfect, you need to know how imperfect you are. You don't need to be perfect, just know and debug consciously. That's enough. What is a high level of mental health? Knowing your own strengths and weaknesses is enough. People who can't pursue perfection and often blame themselves are often more sad.
The conclusion is: study more to improve cognitive ability; Know yourself, know yourself, and constantly adjust your psychological adaptability.