Early years
Dahui was born in Xuancheng, Anhui, to the Xi family. He left home at sixteen and became a Buddhist monk at seventeen. His initiatory name was Zong Gao. Following the tradition of the day, he wandered from Chan community to community, seeking instruction. He studied under a Caodong master and mastered the essentials of the Five Ranks in two years. He studied all the records of the Five Houses of Chan, being particularly drawn to the words of Yunmen Wenyan (Wade–Giles: Yün-men Wên-yen Japanese: Ummon Bun’en), 864-949, founder of one of the "Five Houses" of Chan. He sought out instruction on the sayings of the old masters collected and commented on by Xuedou Chongxian (Wade–Giles: Hsüeh-tou Ch’ung-hsien; Japanese: Setchō Jūken) which became the basis for the koan collection, the Blue Cliff Record.
Tangzhou
Dissatisfied with intellectual study, at the age of twenty-one he went to Treasure Peak, near the modern city of Nanchang in Jiangxi Province, to study with Zhan Tangzhun (Wade–Giles: Chan-t'ang Wen-chun), a master of the Huang-lung branch of the Linji School. Although Dahui developed a great intellectual understanding of Chan, enlightenment eluded him. Recognizing his potential and great intellectual abilities, Zhan Tangzhun made Dahui his personal attendant. One day Tangzhou asked Dahui,
"Why are your nostrils boundless today?"
Dahui replied, "(Because) I’m at your place."
Tangzhou retorted, "You phony Chan man."
Another time, when Dahui was twenty-six, Tangzhou called him over and said,
You can talk about Ch'an very well; you can quote the sayings of former masters and write commentaries on them. You are eloquent in giving sermons and quick with the exchanges during interviews. But there is one thing which you still do not know".
Ta-hui asked what it was.
Tangzhou answered, "What you do not have is the awakening. Thus, when I talk with you in my room, you have Chan. But as soon as you leave the room, you lose it. When you are awake and attentive, you have Chan. But as soon as you fall asleep, you lose it. If you continue like this, how can you ever conquer life and death?"
Dahui agreed, saying, "This is precisely my point of doubt."
Yuanwu
Dahui continued his studies with Yuanwu Keqin. On his way to Tianning Wanshou, a monastery in the old imperial city of Bian (modern Kaifeng), Dahui vowed to work with Yuanwu for nine years and if he did not achieve enlightenment, or, if Yuanwu turned out to be a false teacher, giving approval too easily, Dahui would give up and turn to writing scriptures or treatises.
Yuanwu gave Dahui Yunmen’s saying, "East Mountain walks on the water" as a koan to work through. Dahui threw himself into the koan and struggled with it day and night, giving forty-nine answers to the koan, but all were rejected by his teacher. Finally, on May 13, 1125, he broke through. Later, he recalled the event:
Master Yuan-wu ascended the high seat in the lecture hall at the request of Madame Chang K'ang-kuo (張康國夫人). He said, "Once a monk asked Yun-men this question, 'where do all the Buddhas come from?' Yun-men answered. 'The East Mountain walks over the water' (Tung-shan shuei sheng hsing). But if I were he, I would have given a different answer. 'Where do all the Buddhas come from?' 'As the fragrant breeze comes from the south, a slight coolness naturally stirs in the palace pavilion.'" When I heard this, all of a sudden there was no more before and after. Time stopped. I ceased to feel any disturbance in my mind, and remained in a state of utter calmness.
As it turned out, Yuanwu did not give approval too easily. He said,
It is indeed not easy to arrive at your present state of mind. But unfortunately, you have only died but are not yet reborn. Your greatest problem is that you do not doubt words enough. Don't you remember this saying? 'When you let go your hold on the precipice, you become the master of your own fate; to die and afterward come to life again, no one can then deceive you.
Yuanwu gave Dahui the koan, "To be and not to be --- it is like a wisteria leaning on a tree" to work on and after six months, Dahui achieved the final breakthrough and was recognized by Yuanwu as a Dharma-heir in the Linji tradition.
Teaching career
Yuanwu assigned teaching duties to Dahui and Dahui’s fame spread far and wide. A high ranking government official, the Minister of the Right, Lu Shun, gave Dahui a purple robe and the honorific, "Fori", the Sun of the Dharma. The following year, 1126, the Jürchen Jin dynasty captured the Emperors Huizong and Qinzong; the capital was moved to the south and the Southern Song era began.
Dahui also moved south and taught both monks and laymen. It was at this time that he began his severe criticism of the "heretical Chan of silent illumination" of the Caodong school which he would continue for the rest of his life. He became a great favorite of the educated and literate classes as well as Chan monks and in 1137, at the age of forty-nine, Chancellor Zhang Jun (張浚), a student of Dahui, appointed him abbot of Jingshan monastery in the new capital Lin-an (modern Hangzhou, Zhejiang). Within a few years his sangha grew to two thousand and among his lay followers were many high-ranking officials. Dahui became the acknowledged leader of Buddhism of the Southern Song dynasty.
Exile and return
A letter written by Dahui to a friend during his exile
However, disaster was about to befall him. Because of his association with a high official who fell out of favor with the prime minister, all Dahui’s imperial honors and his ordination certificate were stripped from him and he was sent in exile to Hengzhou (Hunan) in the year 1141. At the age of sixty-two he was transferred to present day Guangdong, a place notorious in those days for plagues and hostile elements. Some fifty of Dahui’s monks died there in a plague. Throughout these difficult years, Dahui continued teaching in the Linji tradition of Chan Buddhism, attracting both gentry and commoners. Finally, in 1155, Dahui was pardoned and was allowed to return to his former monastery at Jingshan where he continued his teaching until he died five years later on 10 August 1163. He wrote a final verse for his disciples, saying, "Without a verse, I couldn’t die."
Birth is thus
Death is thus
Verse or no verse
What’s the fuss?
Emperor Xiaozong of Song bestowed upon him the posthumous title "Chan Master of Great Wisdom," from which the name Dahui derives.