Chapter 6

谷神不死，是謂玄牝。
玄牝之門，是謂天地根。
綿綿若存，用之不勤。

The valley spirit does not die; it is called the dark female.
The gate of the dark female is called the root of heaven and earth.
Unbroken as a thread, it seems always there; drawn on, it never wears out.