This is a sentence that describes "peace of mind"

I don't understand it very well. I hope the following can learn from it

Mr. Qingxiu believes that a person's mind is not quiet. It is not a hollow in the heart, but it should be like the water in a deep pool, which will not make a noise just because of the slightest breeze.

When people are sick, they often calm down. At that time, the perspective from which people think about problems will change, and the way they deal with things will also change. This is also a good thing. So some people say, "Blessed are those who regard every day of their lives as their last."

When the mind is calm, there is naturally no thought. Being thoughtless does not mean that the brain is not active, but that it no longer thinks about meaningless things. There are so many right and wrongs in life, right and wrong, right and wrong. When you think about it calmly, it means nothing, it is just worth a smile.

It is natural for people to be idle as they age. "Doing nothing" does not mean not doing things. When people get old, they also have things they do when they are old, but now they know better what to do. Only when you get older will you realize that there is no need to worry about things that you used to worry about. Only when you get older do you realize that when doing things, you must abide by the Tao and follow the laws of nature. It would certainly be better if people could understand this principle before they grow old. However, those fruits that are sweet when they grow are first sour and then sweet. Think about it again, metaphors are always metaphors, after all, people are not fruits, right?