Passage 2 of the Daodejing:

All beneath heaven knows beauty is beauty only because there's ugliness, and knows good is good, only because there's evil.

Being and nonbeing give birth to one another, difficult and easy complete one another, long and short measure one another, high and low fill one another, music and noise harmonize one another, before and after follow one another:

that's why a sage abides in the realm of nothing's own doing, living out that wordless teaching.  The ten thousand things arise without beginnings there, abide without waiting there, come to perfection without dwelling there.

Without dwelling there: that's the one way you'll never lose it

The great cyclical complementarity of Way is captured by this moment:

They [the Yankees] did it [won this year's World Series] on the eighth anniversary of Rivera’s lowest moment, when he blew Game 7 of the 2001 World Series in Arizona.