This Zhuangzi ‑ Zhi Bei You chapter explores the ineffable Dao via allegories. It argues true Dao cannot be grasped by intellect or words, discussing universal Qi, life‑death transformation and famous idiom‑generating episodes.
Bei Yi (or Pi Yi) was a man from the time of Emperor Yao. Yao’s teacher was Xu You; Xu You’s teacher was Nie Que; Nie Que’s teacher was Wang Ni; and Wang Ni’s teacher was Bei Yi.