a coarse bag..................

You want to learn to catch a mouse?
Don't try to learn from a pampered cat.
If you want to learn the nature of the world,
don't study fine bound books.
The True Jewel's in a coarse bag.
Buddha-nature stops at huts.
The whole herd of folks who clutch at looks of things
never seem to make the connection.

-Shih Te, as translated in The Poetry of Zen