1. The changes of the four seasons and yin and yang make 'it possible for all things to grow.
2. By following this fundamental rule he can maintain normal growth like everything else. Therefore, a sage will preserve yang qi in spring and summer and yin qi in winter and autumn.
3. The changes of yin, yang and the four seasons decide growth, aging, and the death of all things. Acting contrary to it will result in disaster.
4. When you comply with it, you will be immune from diseases. These are the ways of preserving health.
5. A sage strictly follows the ways of preserving health. But a foolish man transgresses them.
Learn more about the theory of Chinese medicine, please read The Six Climatic Factors in TCM.