Chapter 4, Part 6A - Chuang Tzu

Carpenter Shih went to Ch'i and, when he got to Crooked Shaft, he saw a serrate oak standing by the village shrine. It was broad enough to shelter several thousand oxen and measured a hundred spans around, towering above the hills. The lowest branches were eighty feet from the ground, and a dozen or so of them could have been made into boats. There were so many sightseers that the place looked like a fair, but the carpenter didn't even glance around and went on his way without stopping.

His apprentice stood staring for a long time and then ran after Carpenter Shih and said, "Since I first took up my ax and followed you, Master, I have never seen timber as beautiful as this. But you don't even bother to look, and go right on without stopping. Why is that?"

"Forget it - say no more!" said the carpenter. "It's a worthless tree! Make boats out of it and they'd sink; make coffins and they'd rot in no time; make vessels and they'd break at once. Use it for doors and it would sweat sap like pine; use it for posts and the worms would eat them up. It's not a timber tree - there's nothing it can be used for. That's how it got to be that old!"
~ Burton Watson translation via Terebess Asia Online ~

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