"The Sixth Patriarch Hui Neng"

One day the Fifth Patriarch told his monks to express their wisdom in a poem. Whoever had true realization of his original nature (Buddha Nature) would be ordained the Sixth Patriarch. The head monk, Shen Hsiu, was the most learned, and wrote the following:

The body is the wisdom-tree,

The mind is a bright mirror in a stand;

Take care to wipe it all the time,

And allow no dust to cling.