《列子·天瑞》
黄帝说： 精神进入众妙之门，骨骸回归物质本原，我还有什么留存呢？ 
黄帝曰： 精神入其门，骨骸反其根，我尚何存？ 
The Yellow Emperor said: The divine energy enters the Profound Mystery Gate, and the skeleton returns to its physical origin. What will I retain here?