道可道，非恆道；
The way you can put into words is not the way that holds.
名可名，非恆名。
The name you can fix in place is not the name that lasts.
無名，天地之始；
Before naming: the beginning of sky and earth.
有名，萬物之母。
In naming: the mother of ten thousand things.
故，
So —
恆無欲也，以觀其妙；
Without wanting, you see the root.
恆有欲也，以觀其徼。
With wanting, you see the edges.
此兩者同出而異名，
These two come from the same place, differently named.
同謂之玄。
That sameness: call it dark.
玄之又玄，眾妙之門。
Dark upon dark: the doorway through which things come through.
The first chapter of the Daodejing is the founding argument and the founding problem. It names, in eight lines, a difficulty that cannot be solved but can be understood — and understanding it changes what you do with it.
The Han censors replaced 恆 (héng — the self-sustaining, ungovernable) with 常 (cháng — the regular, the administrable) to make the text legible to the state. You perform the identical substitution on your own experience, continuously, for the identical reason: what is ungovernable is inconvenient. What can be scheduled and reported on is manageable. The Mawangdui manuscripts restore the more dangerous word. You do not have to accept the substitution.
You have been naming things in the dark your entire life. The dark is not a problem to be solved. It is the condition.
What the chapter asks of you is not a spiritual achievement. It is an epistemic discipline: notice the two modes of attention you already possess — the one that approaches without wanting a particular answer, the one that wants and therefore reaches the edge of things — and stop treating one as superior to the other. They share a source. They see at different scales. The practice called 守一 (shǒu yī, holding to the one) is not about choosing the emptier mode. It is about returning, repeatedly, to the place where both arise, before you have decided what you are looking for. The gate opens inward. You already know this.