1, from Confucius. 2, "Yi" is not far from a book, because Tao is also moving repeatedly, and the change is not permanent. Impermanence, combining rigidity with softness, can't be a code, only change. If the above words come from Yi Zhuan, you have the meaning of asking questions. 3. The Book of Changes is a collection of works to explain and develop the Book of Changes during the Warring States Period. Its theory originated from Confucius, which was formed by Confucius' later study. There are 7 kinds of Yi Zhuan (10), which are Xun Zhuan, Xiang Zhuan, Classical Chinese Zhuan, Jie Zhuan, Shuo Gua Zhuan, Xu Gua Zhuan and Za Gua Zhuan respectively. Since the Han Dynasty, they have also been called "Ten Wings".