Tokusan was studying Zen under Ryutan. One night he came to Ryutan and asked many questions. The teacher said: "The night is getting old. Why don't you retire?"
So Tokusan bowed and opened the screen to go out, observing: "It is very dark outside."
Ryutan offered Tokusan a lighted candle to find his way. Just as Tokusan received it, Ryutan blew it out. At that moment the mind of Tokusan was opened.
"What have you attained?" asked Ryutan. "From now on," said Tokusan, "I will not doubt the teacher's words."
The next day Ryutan told the monks at his lecture: "I see one monk among you. His teeth are like the sword tree, his mouth is like the blood bowl. If you hit him hard with a big stick, he will not even so much as look back at you. Someday he will mount the highest peak and carry my teaching there."
On that day, in front of the lecture hall, Tokusan burned to ashes his commentaries on the sutras. He said: "However abstruse the teachings are, in comparison with this enlightenment they are like a single hair to the great sky. However profound the complicated knowledge of the world, compared to this enlightenment it is like one drop of water to the great ocean." Then he left that monastery.
Mumon's comment: When Tokusan was in his own country he was not satisfied with Zen although he had heard about it. He thought: "Those Southern monks say they can teach Dharma outside of the sutras. They are all wrong. I must teach them." So he traveled south. He happened to stop near Ryutan's monastery for refreshments. An old woman who was there asked him: "What are you carrying so heavily?"
Tokusan replied: "This is a commentary I have made on the Diamond Sutra after many years of work."
The old woman said: "I read that sutra which says: 'The past mind cannot be held, the present mind cannot be held, the future mind cannot be held.' You wish some tea and refreshments. Which mind do you propose to use for them?"
Tokusan was as though dumb. Finally he asked the woman: "Do you know of any good teacher around here?"
The old woman referred him to Ryutan, not more than five miles away. So he went to Ryutan in all humility, quite different from when he had started his journey. Ryutan in turn was so kind he forgot his own dignity. It was like pouring muddy water over a drunken man to sober him. After all, it was an unnecessary comedy.