Experience, Zen, birds, there you go:
One day Baizhang accompanied Mazu on a walk. A flock of wild ducks flew by them.
Mazu said, "What's that?"
Baizhang said, "Wild ducks."
Mazu said, "Where'd they go?"
Baizhang said, "They flew away."
Mazu then twisted Baizhang's nose so hard that he cried out.
Mazu said, "So you say they've flown away!"
Upon hearing these words Baizhang attained enlightenment.
(from: Zen's Chinese Heritage by A.E. Ferguson, p. 77)
"There is no such thing as the real mind. Ridding yourself of delusion: that's the real mind."
(Sheng-yen: Getting the Buddha Mind, p 73)
"Neither cultivation nor seated meditation — this is the pure Chan of Tathagata."
(Mazu Daoyi, X1321p3b23; tr. Jinhua Jia)
“Don’t rashly seek the true Buddha;
True Buddha can’t be found.
Does marvelous nature and spirit
Need tempering or refinement?
Mind is this mind carefree;
This face, the face at birth."
(Nanyue Mingzan: Enjoying the Way, tr. Jeff Shore; T2076p461b24-26)