The Tao that can be told is not the eternal Tao;
The name that can be named is not the eternal name.
'Nothingness' is the beginning of heaven and earth.'
Oneness' is the mother of everythings.
Ever desireless, one can see the mystery.
Ever desiring, one can see the manifestations.
These two spring from the same source but differ in name;
this appears as darkness.
Darkness within darkness.
The gate to all mystery.
—(Gia-Fu Feng & Jane English, 1972).