As did other masters, Huang-po also employed silence as a teaching device, using it to teach wordless insight by example. One particularly pointed story involves none other than his biographer, the official Pei Hsiu. In Pei Hsiu's introduction to his transcript of Huang-po's teachings he says that they first met in 843 when he invited the master to lecture at Lung-hsing Temple in Chung-ling, the district which he governed. Six years later, in 849, the governor was in charge of Wan- ling, and he again invited the master to come and teach, this time at the local K'ai-yan temple.12 When Huang-po arrived in Wan-ling, for what was to be the second teaching session with Pei Hsiu, the story says that the governor made the mistake of presenting the master with a written exposition of the teachings of Ch'an. Huang-po greeted this with silence, his "exposition" of Ch'an. _The Prime Minister invited the Master to the city and presented his own written interpretation of Ch'an to him. The Master took it and put it on the table. He did not read it. After a short silence, he asked the Prime Minister, "Do you understand?" The minister answered, "I do not understand." The Master said, "It would be better if you could understand immediately through inner experience. If it is expressed in words, it won't be our teaching._"13_ _ _The Transmission of the Lamp_ reports that after this episode at Wan- ling, the spirit of Huang-po's school became widespread south of the Yangtze River.14 This exchange brings out the essence of Huang-po's concerns. His most insistent conviction was that Ch'an cannot be taught, that it must be somehow gained intuitively. He was contemptuous of conceptual thought, believing it to be the greatest hindrance to achieving intuitive insight. The problem is the mistaken belief that Zen can somehow be taught and understood if only one grasps the concepts. But concepts only serve to obstruct intuition; Zen intuition can work only outside concepts. As Huang-po phrased it: _Since Zen was first transmitted, it has never taught that men should seek for learning or form concepts. "Studying the Way" is just a figure of speech. It is a method of arousing people's interest in the early stages of their development. In fact, the Way is not something which can be studied. Study leads to the retention of concepts and so the Way is entirely misunderstood.15 _ The use of the rational mind in the study of Ch'an is only meaningful at the beginning. But once the fish of intuitive insight has been snared in the net of the rational mind's ken, the net must be discarded. Elsewhere he likens the extended use of analytical thought to the shoveling of dung.16 Concepts, it turns out, are only one of the mind's many constructs. The mind also provides our perception of concrete objects, thereby "creating" them to suit its needs.