After zazen one evening Porcupine asked, "We examine turning points as our practice. What is the pivot on which this study turns?"
Raven said, "The large intestine."
Porcupine asked, "So, it's all physical?"
Raven said, "All physical, all mental, all moral, all spiritual, all void, all material."
Porcupine thought about this and finally asked, "What's the upshot?"
Raven said, "Trout in the pool, lilies on the bank."
adapted from Robert Aitken, Zen Master Raven