Tell me about Huang Lao's unbelief.

This sentence means that if healthy qi is enriched in it, evil spirits cannot be violated, and evil spirits are accumulated because of insufficient healthy qi.

From: A medical work from the pre-Qin to the Han Dynasty, Huangdi Neijing and On Fever, the original text is as follows:

Qi Bo said: evil combination leads to qi deficiency, yin deficiency leads to yang combination, and less leads to sweating. People with yellow urine have less calories in their stomachs. If you can't restrain it, there will be disharmony in your stomach. When you are depressed, you cough badly. When you come up, you press your lungs hard. For people with moisture, the first thing they see is a slight swelling under their eyes.

Translation:

Qi Bo said: The gathering of evil spirits is due to the lack of healthy qi. When the kidney yin is insufficient, the yang pathogen will gather by taking advantage of deficiency, so it will be short of breath, always fever, sweating and yellow urine. This is because they can't lie on their backs because of excessive internal heat, which is the disharmony in the stomach. Cough gets worse when lying on your back, and water vapor forces your lungs upward. Any patient with moisture can see the omen of slight swelling.

Extended data:

Huangdi Neijing is divided into Lingshu and Suwen, which is the earliest medical classics in China and one of the four classic works of traditional medicine.

Huangdi Neijing is a comprehensive medical work, which establishes the theories of Yin and Yang, five elements, pulse condition, meridians and other aspects of traditional Chinese medicine on the basis of Huang theory, and discusses medicine from a holistic perspective. Its basic materials come from the long-term observation of life phenomena by ancient people in China, a lot of clinical practice and simple anatomical knowledge.

Huangdi Neijing laid the foundation of human physiology, pathology, diagnosis and treatment. It is a medical work with great influence in China and is called the medical ancestor.

References:

Baidu Encyclopedia-Huangdi Neijing: Query and Comment on Fever Theory