Verse 40: Having and Lacking

反者道之動。
Inversion is the movement of the Way
弱者道之用。
Weakness is the application of the Way
天下萬物生於有，
The 10,000 things of the world are born from "having",
有生於無。
"having" is born from "lacking".

Comments
"lacking" can also be understood as the void, nothing.