The Tao is called the great Mother:
empty yet inexhaustible,
it gives birth to infinite worlds.
It is always present within you.
You can use it any way you want.
...Lao Tsu, 6th Century BC
Holotropic Breathwork
Exploring Non-Ordinary Realities
...Lao Tsu, 6th Century BC
- Stanislav Grof, When The Impossible Happens