Tao Te Ching – Lao Tzu – chapter 4
"The Tao is an empty vessel; it is used, but never filled.
Oh, unfathomable source of ten thousand things!
Blunt the sharpness,
Untangle the knot,
Soften the glare,
Merge with dust.
Oh, hidden deep but ever present!
I do not know from whence it comes.
It is the forefather of the emperors."
Tao Te Ching - Lao Tzu | 4