HE WHO KNOWS THE MALE YET CLEAVES TO WHAT IS FEMALE BECOMES LIKE A RAVINE, RECEIVING ALL THINGS UNDER HEAVEN, AND BEING SUCH A RAVINE, HE KNOWS ALL THE TIME OF THE POWER THAT NEVER CALLS UPON IN VAIN, THUS RETURNING TO THE STATE OF INFANCY [THAT IS, THE INFANCY OF MAN].
HE WHO KNOWS THE WHITE, YET CLEAVES TO THE BLACK BECOMES A STANDARD BY WHICH ALL THINGS ARE TESTED. AND BEING SUCH A STANDARD, HE HAS ALL THE TIME AND POWER THAT NEVER ERRS. HE RETURNS TO THE LIMITLESS.
WHO KNOWS GLORY YET CLEAVES TO IGNOMY BECOMES LIKE A VALLEY THAT RECEIVES INTO IT ALL THINGS UNDER HEAVEN. AND BEING SUCH A VALLEY HE HAS ALL THE TIME AND POWER THAT SUFFICES. HE RETURNS TO THE STATE OF THE UNCARVED BLOCK.
-Tao Te Ching, Verse 28