1. the movement of the tao
by contraries proceeds;
and weakness marks the course
of tao's mighty deeds.
2. all things under heaven sprang from it as existing (and named); that existence sprang from it as non-existent (and not named).
反者道之动,弱者道之用。
天下之物生于有,有生于无。
【译文】
正﹑反之间的出入自如,是道的运行特征;柔弱灵动的因势顺导,是道的施用特性。天下各类存在之成其为存在,是因为它们有名,而有名生于无名。