体道
原文
道可道，非常道。名可名，非常名。无名天地之始；有名万物之母。故常无欲，以观其妙；常有欲，以观其徼。此两者，同出而异名，同谓之玄。玄之又玄，衆妙之门。
王弼注
道可道，非常道。名可名，非常名。可道之道，可名之名，指事造形，非其常也。故不可道，不可名也。无名天地之始，有名万物之母。凡有皆始于无，故“未形”、“无名”之时则为万物之始，及其“有形”、“有名”之时，则长之育之，亭之毒之，为其母也。言道以无形无名始成万物，以始以成而不知其所以玄之又玄也。故常无欲，以观其妙；妙者，微之极也。万物始于微而后成，始于无而后生。故常无欲空虚，可以观其始物之妙。常有欲，以观其徼。徼，归终也。凡有之为利，必以无为用。欲之所本，适道而后济。故常有欲，可以观其终物之徼也。此两者同出而异名，同谓之玄，玄之又玄，众妙之门。两者，始与母也。同出者，同出于玄也。异名，所施不可同也。在首则谓之始，在终则谓之母。玄者，冥也，默然无有也。始母之所出也，不可得而名，故不可言，同名曰玄，而言谓之玄者，取于不可得而谓之然也。谓之然则不可以定乎一玄而已，则是名则失之远矣。故曰，玄之又玄也。众妙皆从同而出，故曰众妙之门也。
英文 · James Legge
(Embodying the Dao) The Dao that can be trodden is not the enduring and unchanging Dao. The name that can be named is not the enduring and unchanging name. (Conceived of as) having no name, it is the Originator of heaven and earth; (conceived of as) having a name, it is the Mother of all things. Always without desire we must be found, If its deep mystery we would sound; But if desire always within us be, Its outer fringe is all that we shall see. Under these two aspects, it is really the same; but as development takes place, it receives the different names. Together we call them the Mystery. Where the Mystery is the deepest is the gate of all that is subtle and wonderful.