5 definitions
Knowledge (n.) stuffed in by study and written explanations now passes for practice, where once a single sentence sent men to rest in spontaneity.
A Name (n.) like "Tao" is a fish trap, to be forgotten once the fish is caught; no concept should be built on it.
Seeking (n.) the Buddha nature loses it, since it uses the Buddha to look for the Buddha and the mind to grasp the mind — a full kalpa of effort will not reach it.
Void (n.) men fear falling through when they forget their minds is no void at all but the real realm of the Dharma.
Worship (n.) asks the Buddha for nothing; asked what such worship is for, Huang-po answered with a slap on the face.