The Vajra Prajna Paramita Sutra, p103-104Recognizing the emptiness of all phenomena is actual truth. Recognizing the falseness of all phenomena is common truth. Recognizing that all phenomena are neither empty nor false is the truth of the Middle Way. Furthermore, throughout the present discourse on prajña, nothing has been spoken. It is just as when Subhūti eloquently spoke prajña and the Brahma Heaven King listened well to prajña, until finally Subhūti asked him, “What have I said?”
To which the Brahma god replied, “The Venerable One has not spoken.”
“Well, what have you heard?” pursued Subhūti.
“I also did not hear a thing,” came the reply.
“That is true prajña,” confirmed Subhūti.
When nothing is spoken and nothing is heard, that is called true prajña. So the prajña paramita spoken by the Buddha is not prajña paramita, but is merely called prajña paramita. It is a false name and nothing more.