Chapter 2, Part 7B - Chuang Tzu

The Tâo that is displayed is not the Tâo. Words that are argumentative do not reach the point. Benevolence that is constantly exercised does not accomplish its object.

Disinterestedness that vaunts its purity is not genuine. Courage that is most stubborn is ineffectual. These five seem to be round (and complete), but they tend to become square (and immovable). Therefore the knowledge that stops at what it does not know is the greatest. Who knows the argument that needs no words, and the Way that is not to be trodden?

He who is able to know this has what is called 'The Heavenly Treasure-house.' He may pour into it without its being filled; he may pour from it without its being exhausted; and all the while he does not know whence (the supply) comes. This is what is called 'The Store of Light.'

Therefore of old Yâo asked Shun, saying, 'I wish to smite (the rulers of) Tsung, Kwei, and Hsü-âo. Even when standing in my court, I cannot get them out of my mind. How is it so?' Shun replied, 'Those three rulers live (in their little states) as if they were among the mugwort and other brushwood;-- how is it that you cannot get them out of your mind? Formerly, ten suns came out together, and all things were illuminated by them;-- how much should (your) virtue exceed (all) suns!'
~ James Legge translation via Stephen R. McIntyre ~

Go here to read the introductory post to the chapters of the Book of Chuang Tzu.