What does it mean to use nine in grade nine, grade two and grade three?

The Book of Changes, one of the Three Changes of the Book of Changes (another view: the Book of Changes is three changes, not the Book of Changes), is one of the traditional classics. It is said that it was written by Zhou Wenwang Jichang, and its contents include the Book of Changes and the Book of Changes. Classics are mainly composed of 64 hexagrams and 384 hexagrams, each of which has its own interpretation (hexagrams) for divination. It contains seven languages * * * and ten quatrains explaining hexagrams, which are collectively called "Ten Wings" and are said to have been written by Confucius. ?

During the Spring and Autumn Period, official schools began to evolve into private schools. There is a gradual development before and after the Yi-ology, and a hundred schools of thought contend, so it is easy to divide. Since Confucius praised the Book of Changes, the Book of Changes has been regarded as a Confucian classic and the first of the Six Classics by Confucianism. Outside of Confucianism, there are two parallel schools of Yi-ology and Confucian Yi-ology: one is Yi-ology, which still exists in the old forces; The other is Laozi's Taoist Yi, which began to be divided into three branches.

The General Catalogue of Sikuquanshu divides the origin and evolution of Yi-ology into "two schools and six schools". Two schools, namely, the school of mathematics and the school of righteousness; Six cases, one is divination, the other is auspiciousness, the third is accident, the fourth is old Zhuang Zong, the fifth is Confucianism, and the sixth is history.

Zhouyi is the theoretical source of natural philosophy and humanistic practice in China's traditional ideology and culture, the crystallization of China's ancient thoughts and wisdom, and is known as the "source of Tao". The content is extremely rich, which has had a far-reaching impact on China's politics, economy, culture and other fields for thousands of years.

The Book of Changes is the first of Qunjing and a teaching book.