Look, it cannot be seen – it is beyond form.
Listen, it cannot be heard – it is beyond sound.
Grasp, it cannot be held – it is intangible.
These three are indefinable;
Therefore they are joined in one.

From above it is not bright;
From below it is not dark:
An unbroken thread beyond description.
It returns to nothingness.
The form of the formless,
The image of the imageless,
It is called indefinable and beyond imagination.

Stand before it and there is no beginning.
Follow it and there is no end.
Stay with the ancient Tao,
Move with the present.

Knowing the ancient beginning is the essence of Tao.

Lao Tzu: Tao Te Ching
Chapter 14

Translated by Gia-Fu Feng  馮家福  (1919–1985) and Jane English (1942 – )
Vintage Books, 1989