The song emperors sponsored the studies of Confucianism and subsidized the writings because the teaching of Confucius were necessary to teach the people the way that they could live in harmony and how they could cultivate and live fulfilled lives.
This is the though that was introduced by the Chinese Sage called Confucius. He was the one that taught how people can live to be in harmony with themselves and the society.
The song dynasty was one of the empires that adopted the teachings of Confucius. This was because he using his teachings, the dynasty was able to create a society that was full of scholars and well taught people.
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