I also want to know the three theoretical essences of the Book of Changes.
1, The Book of Changes is one of the oldest documents in China, formerly known as The Book of Changes and The Book of Changes, commonly known as The Book of Changes in the Han Dynasty); It is one of the six Confucian Classics in China (Poetry, Calligraphy, Rites, Music, Book of Changes, Spring and Autumn), among which Jing Yue was later lost, leaving only five Classics. (Later, it was honored by Confucianism as the first of the Five Classics (Zhouyi, Shangshu, Shijing, Book of Rites and Chunqiu);
2. The Book of Changes is a collection of ancient Lianshan, Guizang and Zhouyi (but Lianshan and Guizang have been lost).
The Book of Changes was written very early, around the Western Zhou Dynasty. There are three books of changes, one of which is Zhouyi, which has been handed down from generation to generation. "Zhou" in Zhouyi refers to the Zhou Dynasty, and "Yi" means change. The Book of Changes is the conclusion that Zhou Wenwang reached in prison. It is divided into 30 hexagrams of Shangjing and 34 hexagrams of Xia Jing ... The meaning of the characters has evolved with the development of the times, and the content of Yijing has been difficult to understand in the Spring and Autumn Period and the Warring States Period. Also for its biography, for Yi Chuan, but also for the ten wings. Confucius' contribution to the Book of Changes is to regard it as a classic and list it in the Four Books and Five Classics. It's easy to go back to Tibet by leaving the geomantic omen and so on to Lianshan alone. Therefore, most schools of thought when a hundred schools of thought contend are from the Book of Changes. A hundred schools of thought said that they all originated from this book, and they all originated from these hexagrams painted in the Book of Changes.
3. In fact, there are two kinds of Book of Changes, one is Lianshan Yi, the other is Guizang Yi, and the other is Zhouyi, which are collectively called Sanyi. The Book of Changes in Lianshan is the Book of Changes in Shennong era, and the position of the eight diagrams drawn is different from the Book of Changes. The Book of Changes in the era of the Yellow Emperor was the Book of Changes in Tibet. Zhouyi is Zhouyi.
Lianshan Yi began with the root of hexagrams, Gui Zang Yi began with hexagrams Kun, and in Yijing it began with the stem of hexagrams, which is the difference between the three Yi. Speaking of which, there should be a concept. Now people talk about the Book of Changes, often confined to this Book of Changes, because some people say that Lian Shan Yi and Gui Zang Yi have been lost. Actually, is there any more? This is a big problem. It can be said that this set of things in the "Jianghu" that we China people are talking about now, such as medicine, geomantic omen and Taoism, are the combination of two Yi-ology, namely, linking mountains and returning to Tibet.