Zhou Yi Shen Tong Qi: the Earliest Work That Discusses the Principles of Alchemy, "The King of Eternal Alchemy" (Original Annotation by Guoxue. Com, Approved by Zuo Dongling)

This book is really amazing! It is the earliest work that discusses the principles of alchemy and is known as the "King of Alchemy Sutras". The content inside is profound and difficult to understand. But through reading, I can feel the ancients' observations and thinking about the world and all things. The characters' behaviors and experiences are also very interesting, which gave me a deeper understanding of alchemy. Moreover, this book not only talks about alchemy, but also touches on many philosophies of life, which is also very inspiring for me to start my own business. All in all, this is a great book worth reading!