One day, Nippaku Zanmu was visiting Gensokyo. She went to the Hakurei Shrine.
Upon arriving there, she heard the chime of the shrine’s wind bell and witnessed Hakurei Reimu and Kirisame Marisa arguing over it.

Hakurei Reimu said: ”It’s the wind that’s making the noise!”
Kirisame Marisa said: ”It’s the bell that’s making the noise!”

And Nippaku Zanmu said:
”You fools!
It’s the mind that’s making the noise!”

Reimu and Marisa were confused and brought to silence.
Lacking knowledge of dharma, they did not find great insight and instead drove Zanmu back to Hell.