六祖大師法寶壇經 1.135

1.135

One day, the Master addressed the assembly, saying: 'I have a thing: it has no head and no tail, no name and no designation, no back and no face. Do you all recognize it?' Shenhui stepped forward and said: 'It is the original source of all buddhas, the Buddha-nature of Shenhui.' The Master said: 'I told you that it has no name and no designation, yet you straightaway call it the original source and the Buddha-nature. Even if you have a thatched roof over your head in the future, you will only become a follower who understands through intellectual knowledge.' After the Patriarch passed away, Shenhui went to the two capitals, Chang'an and Luoyang, greatly propagating the sudden teaching of Caoxi and composing the Xianzong ji, which circulated widely in the world. (This was Chan Master Heze.)