A monk asked, "What is the true monk's eye?"
Changsha said, "So vast and wide that you can't leave it."
Changsha also said, "Those who become buddhas and ancestors can't leave it. The six realms of transmigration can't leave it."
The monk said, "I don't understand what it is that they can't leave."
Changsha said, "In the day, see the sun. In the night, see the stars."
The monk said, "I don't understand."
Changsha said, "The lofty mountains are colored green upon green."
-from Zen's Chinese Heritage by Andy Ferguson