The river, the Tao, the open ground, the source. These are all words, but no thing. Only things have beginnings, or ends. All things (and that includes cats, and people, and impossibly tiny bugs of all kinds) that exist, are. They have being; if they seem to share nothing else, they share that.

The Tao is no thing. It is not a substance. It is without dimensions, without duration, for you can only measure things; but it is. Isness, in fact, is what it is. It can’t have come from anywhere; there is nowhere it could lead. But it is where all things return, even you and I.

The way is empty,
used, but not used up.
Deep, yes! ancestral
to the ten thousand things.

Blunting edge,
loosing bond,
dimming light,
the way is the dust of the way.

Quiet,
yes, and likely to endure…

Tao te Ching, tr. Ursula le Guin