Looked at but cannot be seen -
it is beneath form;
Listened to but cannot be heard -
it is beneath sound;
Held but cannot be touched -
it is beneath feeling;
These depthless things evade definition,
And blend into a single mystery.

In its rising there is no light,
In its falling there is no darkness,
A continuous thread beyond description,
Lining what can not occur;
Its form formless,
Its image nothing,
Its name silence.

~Tao Te Ching