This is one aspect of self-perfection. We can't blame anyone else for our state of health. As a result of the fall man became ignorant of all aspects of life. Thus restoration of knowledge is a part of reaching perfection as well. The secrets of good health are quite simple.
Stress is detrimental to our health.
Not only do our external circumstances produce tension, our state of mind is a key factor as well. Whenever we get angry, tension causes our muscles to strain. This shows that our state of mind affects our body. We have a saying in Korea that when you get angry you start to age. If you get angry once, you move one step closer towards old age.