Purple Air Travels Westward

In front of Hangu Pass, I rode a green ox and there was a vision of "purple air coming thirty thousand miles from the east" in the sky. Xuanzhen witnessed Laozi displaying the magical power of "following the law after speaking", and calmed down the commotion of the soldiers guarding the gate with one word. Xuan Zhen, a young bamboo slip craftsman, was selected by Yin Xi to serve as the recorder of Lao Tzu's westward journey because he was born with yin and yang eyes and could see things invisible to ordinary people. He joined the team with a "Jane of Creation" that can automatically record his words and deeds. As the westbound team left Hangu Pass with the people kneeling in worship, Xuanzhen discovered that the twelve-volume jade volume "Hunyuan Dao Zang" that I carried with me emitted a strange light, suggesting that this would be a journey beyond mortal knowledge.