"Yi" is an inexhaustible ocean of wisdom. It is the crystallization of the thoughts and wisdom of the ancient Han nation and is known as the "source of the great road." The original text of this book comes from the classic version, with precise annotations and examples to help readers better understand the deep meaning of each hexagram and comprehend the deep wisdom contained therein. The purpose of reading the "Book of Changes" is to observe the way of heaven and arrange the way of man. How to read the Book of Changes: Use a system of symbols (Bagua).