Yunmen's "Killing the Cat"
The monks of the eastern and western halls were arguing over a cat.
Master Nanquan came upon them, picked up the cat, and said,
"
If any of you can speak a word of Zen, I will spare the cat. If you cannot, I will kill it." No one could answer.
Nanquan cut the cat in two.
Later, Nanquan told Zhaozhou about the incident.
Zhaozhou immediately took off his sandal, placed it on his head, and walked out.
Nanquan said,
"If you had been there, the cat would have been saved."
Reflection
This seminal koan forces us to confront the limits of conceptual thought. When Nanquan threatens to kill the cat unless someone speaks Zen, no one can respond - their minds remain trapped in intellectual deliberation. Zhaozhou's later response (placing a sandal on his head) demonstrates spontaneous, non-dual action that transcends logic. The story teaches that life-or-death matters cannot be met with hesitation; true awakening requires immediate, embodied presence.