谷
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 never dies
This is called the mysterious female
The gateway of the mysterious female
Is called the root of Heaven and Earth
Continuous, seeming to exist
Use it and it is never exhausted
道德經第六章
The Immortal Feminine Principle