This chapter introduces the concept of the Tao and discusses how it is too great to be defined by a single name. It explains that while the Tao is nameless and eternal, individual things in the world were created and given names to help humans understand them. However, these named things are merely effects that stem from something more subtle and nameless. When people look past names, they can sense the deeper, nameless cause behind all effects. The cause and effects are two aspects of the same thing and are both profound and mysterious, especially at their deepest level known as the "Gate of the Great Truth".