Since ancient times, the Chinese continent has evolved with its various ethnic cohorts living together as family or as a tribal society that either merged or divided. They alternated between several small or large countries which led to changes in ruling Dynasties and Royalties. Also, other powers and nations residing on the periphery of China used their growing powers to occupy central China and assimilated to the cultures of main race after forming a new country.
The concept of "Chineseness" evolved and China as the center of the world began as follows. In the beginning when the theory of Yin and Yang was forming Fuxi - BC 4700 (who held the leader position in the family or united family society) placed a wood stick in the center of a circle and measured the shadow of the sun to create what we call today... a calendar.
This calendar divided the year into 24 seasons thus making it convenient for farming and fishing. Of course, sundials and water clocks did exist at the time but they were only used inside the courts. For the public, it was easier to judge the days by observing the changing shapes of the moon, hence the lunar calendar was created.
At the time of Fuxi, the calendar only had marks but was completed over several generations and passed on to their descendants. With these theories, the production of foods increased leading to the Age of Wars as countries of small and medium sizes formed. During this time, the rulers needed many Wise Men to create a stronger and bigger country. The Rulers decided to increase the number of followers and accepted the policies that the Wise Men proposed. The Rulers then had to possess ideology that virtuous subjects, servants, Generals and the public were willing to accept and confirm to them.
To summarize, at home children obey the parents who were meant to nurture and teach the children. As this developed, not only for families but for neighbors and the general society, offering one's services voluntarily is the fundamental grounds for which a Ruler's role is based. The personal and governmental morality, the moral obligations of the ruler was to treat his people as his children and act accordingly to protect them. This thought process extended for his people to serve him as a parent applies to the theory of Yin and Yang (according to the Law of Nature ideology).
Confucius (BC 552-479) is the one who organized the aforementioned theory and set up an academy to educate the students and these disciples progressively developed his studies. In particular, the theory of Yin and Yang which have been previously passed down with marks, was written down in characters by Confucius so that the general public can easily learn.
So the person who learned Chinese medicine read Chinese herbal medicine books were able to treat simple cases. After the death of Confucius, his disciples and followers created a shrine and paid respect (worship) to him on his death anniversary. Still today, people continue to do so.
However, as the Kingdom era changed to modern societal system, it has become scorned as a superstition. There was discord between the Chinese medicine that of the modern education system. Under these circumstances, it was not easy learning Yi Jing and Chinese Medicine.