The Taoist classic traditionally attributed to the philosopher Lie Yukou is the Liezi.
The Liezi is also called the True Classic of the Perfect Emptiness. It is one of the major texts associated with philosophical Taoism, alongside the Daodejing and the Zhuangzi. The work is arranged in eight chapters and presents parables, dialogues, cosmological ideas, and reflections on spontaneity and the limits of human knowledge.
Lie Yukou is described in early Chinese tradition as a thinker who lived before Zhuangzi, but historians debate whether he was a historical author and whether the received book preserves material from one person. The text likely reached its present form much later than the period traditionally assigned to Lie Yukou, probably during the early medieval era.
The Liezi is often confused with the Daodejing because both are Taoist classics. However, the Daodejing is traditionally linked to Laozi, while the Liezi is associated with Lie Yukou.