I don't know who wrote "Da Xue", but according to "Zeng Ziyue" in the book, it is not sufficient for later generations to identify its author as Ceng Zi and his disciples.
The ancient legend of the golden mean was written by Confucius' grandson, Mencius' teacher and children. When Confucius died, Zisi was only three years old. We can't expect a three-year-old child to inherit the lifelong learning of his former teacher.
The methods of "university" are: discipline, knowledge, honesty, honesty, self-cultivation, keeping the family in order, governing the country and leveling the world.
The method of the golden mean is: erudition, interrogation, careful thinking, discernment and persistence.
The scope of "behavior" discussed in Great Learning and The Doctrine of the Mean is still: monarch and minister, father and son, couple, brother Kun and friends.
As to whether to respect morality or learn Taoism first, this is a controversial issue among Confucian scholars in the Song Dynasty. Until then, no one will study it as a problem.
After Confucius, one school remembered what Confucius said and regarded "filial piety" so important that later generations completely buried "individual" in family ethics. "I" is not "I" at all, but "the remains of my parents"
Mozi and Yang Zhu are actually two kinds of extremism. Yang Zhu is an extreme "individualist". He won't do anything beneficial to the world. Mozi is an extreme "individualist" and should take care of others' as his own. The former separates the unity between me and the world, while the latter nurtures the particularity of individuals. Mencius scolded them all and then began to promote the concept of "harmony"
Confucianism, with the sign of "filial piety", said: Thinking about things, caring for your loved ones, you have to cultivate yourself. Because we should be filial to our parents, we should cultivate our self-cultivation In fact, "The Doctrine of the Mean" says: If you want to cultivate yourself, you can't ignore your relatives. The two concepts are just the opposite. One is the philosophy of neglecting the individual's filial piety, and the other is the philosophy of cultivating the individual.
If one word is used to describe the golden mean, it is "sincerity". Honesty is the way of heaven and the way of being a man. Human nature is "sincere". Doing things with nature and giving full play to its role is "education" and this is the method of "sincerity". The doctrine of the mean is to fully develop one's own nature, make one's behavior match the natural laws of heaven, and be able to "reach the sky".
The Book of Filial Piety itself is an extreme, which cannot reflect Confucius' exposition of filial piety in The Analects of Confucius, nor can it be regarded as Confucian orthodox philosophy of life or ethical thought. The function of "The Book of Filial Piety" is actually a "family style" created by "your father" for thousands of people in Qian Qian in a "family world" environment. The emperor is everyone's father. If everyone is filial, there will be no rebellion. Orthodox Confucianism is a staunch supporter of "sharing the world".