"Su Wen Ci Zhi Lun" said: Qi is strong; Weak qi leads to physical weakness; Loss of qi leads to death. Chinese medicine doesn't mean that you die when you die, but that you can't breathe. "Be soft" means that all parts of the body should be soft and never let them be hard. I used to use grass as a metaphor. When grass is full of vitality, it is very soft. When you die in autumn, it becomes hard. People's arteries should be soft, and once they become hard, it is not a good thing. The honeycomb tissue of the liver is soft, and once it hardens, it is also a terrible thing.
Regarding "baby", Lao Tzu said in Chapter 55: "Virtue is thicker than children. Poisonous insects don't sting, wild animals don't catch, and birds don't fight. The bones are weak and the tendons are soft. The combination of the unknown and the unknown is perfect. Counting all day is not dumb, but also harmonious. " Baby is a symbol of weakness and an object advocated by Laozi. Lao Tzu likes to compare water and babies to weakness. Whether exclusive or soft, everything should be carried out in a "natural" state. Lao Tzu wants us to be like babies, not to teach people to go back to being babies, but to be as pure and pure as babies, full of qi and blood, harmonious in form and spirit, lively and natural. When life returns to a baby, its qi can be soft but not rigid, moist but not dry. As the saying goes, harmony gives birth to people, and harmony gives birth to good fortune. A mass of air flows all over the body, and the sick gas is naturally eliminated. Many methods of Taoist cultivation are transformed from this.
There is a jargon in the field of cultivation or health preservation: people are born in harmony, but immortals are born instead, and only yin and yang are reversed. If you want to grow up against your age, you have to return to nature the day after tomorrow, and adults will return to the state of babies. The first way is to breathe evenly, slowly, lightly and gently, just like a baby, even the state of the baby in the mother's belly, that is-fetal interest.