A monk asked the Chinese Ch'an master Chien Paling:
-What is the difference between the meaning of the Sutras and that of the Patriarch?
The master replied:
-When it is cold, hen would go up on a tree and duck down to water.
‘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)