Yunmen Wenyan (864–949 CE) was one of the most influential Chan (Zen) Buddhist masters during the Five Dynasties period in China. Known for his sharp wit and profound teachings, Yunmen played a pivotal role in shaping the development of Chinese Chan Buddhism, particularly through founding the Yunmen School, which became one of the “Five Houses” of Chan. He is especially noted for his concise yet profound method of teaching, often encapsulated in what is known as the “Yunmen One-Word Barrier”.
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