第四十章     柔强循环

反者道之动, 弱者道之用。 天下万物生于有，有生于无。

Cyclingwithin Polarity

Returning within polarity is themovement of the Tao.

Receptivity is the way it isused.

All things are born of Being.

Being is born of Non-being.

 [译文]

循环往复是道的运行规律。道的功用是由无形的柔弱显现为有形的物质。