"Healthy qi should be kept inside, and evil should not be done" is a famous saying in Huangdi Neijing, Suwen and Acupuncture Theory, which is regarded as one of the core concepts of traditional Chinese medicine. Huangdi Neijing is an important representative of ancient medical classics in China, which has a vital influence on the theory of traditional Chinese medicine and the methods of diagnosis and treatment.

"Healthy qi should be kept inside, and evil should not be done" means that the human body has an inherent and abundant healthy qi, which is the basis and guarantee for maintaining human life activities. Only by being full of healthy qi can we resist foreign evil spirits. If healthy qi is insufficient, pathogenic factors will take advantage of it and lead to diseases. Therefore, maintaining internal healthy qi is an important prerequisite for preventing and treating diseases.

this sentence also illustrates the concept of traditional Chinese medicine, that is, the human body itself has the ability to resist diseases. Traditional Chinese medicine believes that the occurrence of diseases is caused by the internal imbalance of Yin and Yang and the unsmooth qi and blood. Only by adjusting the internal balance of Yin and Yang, dredging qi and blood and enhancing immunity can the disease be cured. Therefore, Chinese medicine treatment emphasizes the principles of "holistic concept" and "syndrome differentiation and treatment", and pays attention to the internal conditioning of the human body to achieve the purpose of curing diseases.

in addition, "healthy qi should be kept inside, and evil should not be done" also emphasizes the importance of personal hygiene and environmental hygiene. Personal hygiene includes matters needing attention in diet, daily life and exercise, while environmental hygiene includes quality control in air, water and food. Only by maintaining good personal and environmental hygiene, can we keep the healthy energy in the human body and prevent and treat diseases.

in a word, "healthy qi should be kept inside, and evil should not be done" is a very important famous saying in traditional Chinese medicine, which emphasizes the importance of healthy qi, personal hygiene and environmental hygiene for the prevention and treatment of diseases. It is not only the core of TCM theory, but also an important principle that people must follow in their lives.