'In the Unborn,' by Bankei

"Not a single one of you people at this meeting is unenlightened. Right now, you're all sitting before me as Buddhas. Each of you received the Buddha-mind from your mothers when you were born, and nothing else. This inherited Buddha-mind is beyond any doubt unborn, with a marvelously bright illuminative wisdom. In the Unborn, all things are perfectly resolved. I can give you proof that they are. While you're facing me hearing me speaking like this, if a crow cawed or a sparrow chirped, or some other sound occurred somewhere behind you, you would have no difficulty knowing it was a crow or a sparrow, or whatever, even without giving a thought to listening to it, because you were listening by means of the Unborn."

(Bankei Yotaku Zenji)

The above quotation comes from the Zen Master Bankei (1622-1693). For more on him, read the following: Review: Bankei Zen, by Peter Haskel.