Tian Kaizhi is a student who wants kidneys. He went to see Zhou and told Zhou that he was a person who specialized in health preservation. Did you get anything from studying with him? Tian Kaizhi is very modest. He said I was just a waiter and servant standing at the door with a broom. What useful information can I hear from the teacher? Zhou Weigong is more honest. If you are not modest, just say it. Tian Kaizhi said, I once heard the teacher say, "Those who are good at keeping in good health, if they keep sheep, will be whipped according to the latter." What does this sentence mean? People who are good at keeping in good health are like herding sheep. You should use a whip to make the sheep run faster!

After Tian Kaizhi finished the metaphor of shepherd, Zhou asked him how to explain it. Tian Kaizhi said that there was a man named Shan Bao in the state of Lu. He lives on the hillside and drinks clear spring water. He has nothing to do with others and has no conflict of interest. He is a hermit who has nothing to do with others and lives his own life. So at the age of 70, he still has the color of a baby, and his face is as fresh and shiny as a baby. But one day he met a tiger, and the hungry tiger swallowed him and died in the tiger's mouth. Then there was another person named Zhang Yi. No matter whether he is rich or poor, he greets and salutes others all the way. Everyone respects him, but he doesn't pay attention to his health. At the age of 40, he had a fever and died.

Tian Kaizhi said that Shanbao was good at keeping in good health, but not good at dealing with his relationship with everything in the world, so he was killed and eaten by a tiger. Zhang Yi, on the other hand, was good at improving her relationship with the external environment and others, but did not pay attention to maintaining her body, so she lost her viscera and eventually died of illness due to her viscera. These two people are people who don't pay attention to urging backward sheep.

What does Tian Kaizhi mean? If you want to live forever and be healthy, you must do a good job in both internal and external causes. Handle the relationship between yourself and others, the relationship between heaven and earth, which is external; Internally, we should pay attention to self-cultivation, be close to nature, and don't chase things like fame and fortune too much.