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In our conventional concept, qualitative change can occur when quantitative change accumulates to a certain extent, so the quantity here is an emphasized quantity, not a number. In Treatise on Febrile Diseases, this quantity refers to weight and quantity. Different weights, quantitative change will lead to qualitative change; And the quantity is different, it can also be qualitatively changed. This is different from our traditional concept. For example, it is easy to understand that the dose change of drugs causes qualitative change, but it is not easy to understand that the quantity change of drugs causes qualitative change.

From quantitative change to qualitative change, we can cite a prescription dose in Treatise on Febrile Diseases. Many times, according to the dose of modern science, when reviewing the dose in Treatise on Febrile Diseases according to Ke's measurement unit unearthed in the Eastern Han Dynasty, Li Kelao changed one or two doses from 3 grams in the textbook to 15.625 grams, and the effect changed dramatically. It can be seen that there can be no qualitative change without quantitative change.

It is easy to understand that quantitative change causes qualitative change. Let's focus on the qualitative change caused by numerical changes. Let's give a few examples to illustrate that Zhigancao decoction is a recipe for nourishing yin, with 30 jujubes. This thirty is the "group yin meeting", which is the sum of the yin numbers in ten cardinal numbers. That is, two, four, six, eight and ten are added together, so that the sum of a group of yin can naturally have the effect of nourishing yin.

Another example is Danggui Sini Decoction, which is used to treat the syndrome of "cold hands and feet, rapid pulse and heartbreak", warming and tonifying yang. This recipe uses 25 dates, and these 25 dates are the "Youth League", which is the sum of yang numbers in ten cardinal numbers, that is, the sum of one, three, five, seven and nine.

These two prescriptions have opposite effects because the figures are different. Maybe some people want to argue, if the jujube is big and small, and the weight is exactly the same, what effect will it have? If only weight is considered, then this proposition seems doubtful. We guess, according to the number of changes, according to the number of changes, each is a complete life, has its own unique kinetic energy, regardless of size, is unique, so it is possible to have qualitative differences caused by this number change. The number changes, the image changes, the image changes, and the yin and yang will also change. The fundamental change of yin and yang will change the whole situation.

From the examples here, we also seem to understand the differences between the three levels of things, images and numbers in Zhouyi. The material level is mainly the accumulation of weight, which reflects the qualitative change brought about by quantitative change. The level of image is mainly caused by the nature of Taoism, which leads to the unity of heaven and man. Several levels reflect the pattern change caused by the change of yin and yang, and the qualitative change of the overall change.