One day, when the brilliant Chinese Cha'n master Chao-chou was sweeping the court of the monastery, a man asked him:
-Ch'an monastery supposed to be clean and pure. Why is there dust to sweep?
‘It is the single (nature of ) mind
which encompasses all of Samsara and Nirvana. Even though its inherent nature
has existed from the very beginning, you have not recognized it.
(Self-Liberation Through Seeing With Naked Awareness)