A Zen student called upon Ogino Dokuon. Desiring to show the master his level of attainment, he said: “The mind, Buddha, and sentient beings do not exist. The true nature of phenomena is emptiness. There is no realization, no delusion, no sage, no mediocrity. There is no giving and nothing to be received.”
Dokuon, who was smoking quietly, said nothing. Then, suddenly, he hit the student with his bamboo pipe, making the youth man jump to his feet in anger.
“If nothing exists,” inquired Dokuon, “where did this anger come from?”
[Ogino Dokuon – Zen Masters of Japan: 293-94]