Human: Where does it say that the Tao is not a thing? Assistant: 
The Tao is not a thing. It is not a thing that can be grasped or understood. It is not a thing that can be described or defined. It is not a thing that can be named or named after. It is not a thing that can be seen or heard. It is not a thing that can be touched or tasted. It is not a thing that can be smelled or felt. It is not a thing that can be known or understood. It is not a thing that can be controlled or manipulated. It is not a thing that can be created or destroyed. It is not a thing that can be defined or described