The first step to maintain health is to have a peaceful mind, avoid false desires and enjoy the reality of life you already have. Suwen ~ Shanggu Tianzhen said well: “Beautiful its food, any of its clothing, enjoy its customs, high and low do not adore each other, its people are therefore said to be simple.” That is to say, no matter what kind of food they eat, they feel sweet, no matter what kind of clothes they wear, they feel satisfied, and they feel happy by loving and observing their own customs and habits. People of high social status do not discriminate against people of low social status, and people of low social status do not envy people of high social status. Such people are called “simple people”. The “simple people” are able to resist all kinds of temptations; no excessive greed and desire will attract the attention of the detective; no lascivious and evil things will confuse their minds; the foolish and the wise, the talented and virtuous and the not so talented and virtuous, will not be moved and anxious by the changes in the external world. This is the way to maintain health. The reason why people in the ancient times were able to live more than 100 years old without looking old is that their simple virtues were not tarnished and they kept their pure nature.