Why is the Book of Changes the first of all classics?

The Book of Changes is the theoretical source of natural philosophy and humanistic practice in China's traditional ideology and culture. It is the crystallization of the thoughts and wisdom of the ancient Han nationality and is known as the "source of the road". It is a study of ancient emperors and a compulsory skill for politicians, strategists and businessmen. The Book of Changes is an outstanding representative of Chinese traditional culture. Vast, subtle and all-encompassing, it is also the source of Chinese civilization.