Lung-t'an was instrumental in the conversion of Te-shan Hsüan-chien (780-865). Te-shan, born of a Chou family in Cheng-tu, Szechuan, began early as a member of the Vinaya order, steeped in scriptural learning. He made a special study of the Diamond Sutra on the basis of the learned commentaries of the Dharma master Ch'ing-lung. He lectured on this sutra so frequently that his contemporaries nicknamed him “Diamond Chou.” Later, hearing about the prosperity of the Zen platform in the south, he became indignant and said, “How many homeleavers have spent a thousand kalpas in studying the Buddhist rituals, and ten thousand kalpas in observing all the minute rules of the Buddha. Even then they have not been able to attain Buddhahood. Now, those little devils of the south are bragging of pointing directly at the mind of man, of seeing one's self-nature and attaining Buddhahood immediately! I am going to raid their dens and caves and exterminate the whole race, in order to requite the Buddha's kindness.”
Carrying on a pole two baskets of Ch'ing-lung's commentaries, he left Szechuen for Hunan, where Lung-t'an was teaching. On his way, he encountered an old woman selling pastries, which in Chinese were, and still are, called “mind-refreshers.” Being tired and hungry, he laid down his load and wanted to buy some cakes. The old woman, pointing at the baskets, asked, “What is this literature?” He answered, “Ch'ing-lung's commentaries on the Diamond Sutra.” The old woman said, “I have a question to ask you. If you can answer it, I will make a free gift of the mind-refreshers to you. But if you cannot, please pass on to another place. Now, the Diamond Sutra says: ‘The past mind is nowhere to be found, the present mind is nowhere to be found, and the future mind is nowhere to be found.' Which mind, I wonder, does Your Reverence wish to refresh?” “Te-shan had no word to say, and went on to Lung-t'an. After he had arrived at the Dharma hall, he remarked, “I have long desired to visit the Dragon Pond. Now that I am here on the very spot, I see neither pond nor dragon.” At that time, the master Lungt'an came out and said to him, “Yes, indeed, you have personally arrived at the true Dragon Pond.” Te-shan again had nothing to say. He decided to stay on for the time being. One evening, as he was attending on the master, the latter said, “The night is far advanced. Why don't you retire to your own quarters?” After wishing the master good night, he went out, but returned at once, saying, “It's pitch dark outside!” Lung-t'an lit a paper-candle and handed it over to him. But just as he was on the point of receiving the candle, Lung-t'an suddenly blew out the light. At this point, Te-shan was completely enlightened, and did obeisance to the master. The master asked, “What have you seen?” Te-shan said, “From now on, I have no more doubt about the tongues of the old monks of the whole world.”
Next morning, the master ascended to his seat and declared to the assembly, “Among you there is a fellow, whose teeth are like the sword-leaf tree, whose mouth is like a blood-basin. Even a sudden stroke of the staff on his head will not make him turn back. Some day he will build up my doctrine on the top of a solitary peak.”
On the same day, Te-shan brought all the volumes of Ch'ing-lung's Commentaries to the front of the hall, and, raising a torch, said, “An exhaustive discussion of the abstruse is like a hair thrown into the infinite void, and the fullest exertion of all capabilities is like a little drop of water falling into an unfathomable gulf.” Thereupon he set the commentaries to fire.
This episode is not merely spectacular but profoundly suggestive. It recalls to mind what Lao Tzu has said, “Where darkness is at its darkest, there is the gateway to all spiritual insights.” In the present instance, the night was dark enough, but it became infinitely darker after the candle was lit and blown out again. When all external lights were out, the inner light shone in all its effulgence. But, of course, this did not work automatically. It worked in the case of Te-shan because his mind was just at that moment ready for the enlightenment. The little chick was stirring in the egg and trying to break through the shell; and it took just a peck by the hen on the outside to effectuate the breakthrough.
Te-shan's act of burning the learned commentaries and his realization that all discursive reasonings of the philosophers were no more than a hair in the infinite void should remind us of that St. Thomas Aquinas in his last days said to his secretary who was still urging him to continue his writing: “Reginald, I can do no more; such things have been revealed to me what all the writings I have produced seem to me like a straw.”