What is the most important quotation from chapter six?

Isn't this a great book?  I loved this book and the movie.  I would say a very important part of chapter six is "The Story of The Blessings of El-Ahrairah."

Long ago, the great Frith made the world. He made all the stars, and the Earth lived among the stars. He made all the animals and birds, and at first, he made them all the same. Now, among the animals in these days was El-Ahrairah, the prince of rabbits. He had many friends, and they all ate grass together. But after a time, the rabbits wandered everywhere, multiplying and eating as they went.

Then Frith said to El-Ahrairah, 'Prince Rabbit, if you cannot control your people, I shall find ways to control them.' But El-Ahrairah would not listen. He said to Frith, 'My people are the strongest in the world.'

This angered Frith, and he determined to get the better of El-Ahrairah. And so, he gave a present to every animal and bird, making each one different from the rest. When the fox came, and others, like the dog, and cat, hawk, and weasel, to each of them, Frith gave a fierce desire to hunt and kill the children of El-Ahrairah.

Your people cannot rule the world, for I will not have it so. All the world will be your enemy, Prince with a Thousand Enemies, and whenever they catch you, they will kill you. But first they must catch you, digger, listener, runner, prince with the swift warning. Be cunning and full of tricks and your people shall never be destroyed.

Dandelion is the one who tells the story about El-Ahrairah, the rabbit folk hero.  He relates the story so that the members of the warren will better understand why they live as they do and how their history affects their lives in the present.  Trickery is an important theme in the book and El-Ahrairah was the best at rabbit trickery.