Shoyoroku - Case 93: Roso Does Not Understand

Roso [1] asked Nansen,
  "'People do not recognize the Mani[2]-jewel. I picked it up myself in the
   Tathagata treasury.' [3] What is this treasury?"
Nansen said,
  "Old Master O [4] exchanges questions and answers with you. That's it."
Shiso said,
  "How about when there is no exchange of questions and answers?"
Nansen said,
  "That's also the treasury."
Shiso said,
  "What is the jewel?'
Nansen said,
  "Reverend Shiso!"
Shiso said, 
  "Yes!"
Nansen said,
  "Get out. You don't understand my words."

[1]: Mistakenly the original text renders "Roso" (Nansen's elder brother in
     Dharma); in reality it should be "Shiso" (Nansen's student), as Nansen's
     question indicates.
[2]: "Mani" in Sanskrit means "perfect freedom" ­ another name for Buddha
     nature.
[3]: A quote from the famous Shodoka by Yoka Daishi.
[4]: Nansen himself.