Thus, the Sage uses various rights and wrongs to harmonize with others and yet remains at rest in the middle of Heaven the Potter’s Wheel. - Zhuang Zhou

A beam or pillar can be used to batter down a city wall, but it is no good for stopping up a little hole - this refers to a difference in function. Thoroughbreds like Qiji and Hualiu could gallop a thousand li in one day, but when it came to catching rats they were no match for the wildcat or the weasel - this refers to a difference in skill. The horned owl catches fleas at night and can spot the tip of a hair, but when daylight comes, no matter how wide it opens its eyes, it cannot see a mound or a hill - this refers to a difference in nature. Now do you say, that you are going to make Right your master and do away with Wrong, or make Order your master and do away with Disorder? If you do, then you have not understood the principle of heaven and earth or the nature of the ten thousand things. This is like saying that you are going to make Heaven your master and do away with Earth, or make Yin your master and do away with Yang. Obviously it is impossible.

Men of the world who value the Way all turn to books. But books are nothing more than words. Words have value; what is of value in words is meaning. Meaning has something it is pursuing, but the thing that it is pursuing cannot be put into words and handed down. The world values words and hands down books but, though the world values them, I do not think them worth valuing. What the world takes to be values is not real value.

Know the male but hold to the female; be the ravine of the world. Know the unstained, but hold to the disgraced; be the valley of the world. Everyone else chooses to be the first, but I choose to be last. This is called accepting the filth of the world. Everyone else chooses to be full, but I choose to be empty, for it is because I store up nothing that I have more than enough — like a range of rolling hills stretching on before me, more than enough!