Laozi is knowledgeable and served as an official in charge of books and classics in the Zhou Dynasty. When he was in his seventies, there was chaos in the world, and wars between governors for territory and power often occurred. I expected that there would be more wars in the future, so I resigned and rode on a green cow, leaving Luoyang and heading west to spend my old age. One morning, Guan Lingyin of Hangu, who is good at observing astronomical phenomena, suddenly saw the purple gas in the east and was greeted when he left the customs. Sure enough, he saw an old man with a beard like snow and a fairy wind riding a green cow. This is Lao Zi. Yin left Lao Tzu and asked him to do an article before he left. Laozi wrote an article about "Tao" and "virtue", which was about 5,000 words. Later, people printed this article into a book with the title of Laozi and Tao Te Ching. After writing the article, I rode on a green cow and headed west. I don't know where I went after that. Since then, among many Taoist immortals, Laozi has become the supreme god, known as the "Taiqing Moral Heaven Zun" and respected as the "Tai Shang Lao Jun" among the people.