景德傳燈錄 23.9

23.9

Upādhyāya Yao of Kangguo in Xinzhou. A monk asked, “What matter did Mañjuśrī and Vimalakīrti discuss with each other?”
The master said, “Only when you understand it behind the skull will you get it.”
[The monk] said, “An ancient said: ‘Apprehend it within the skull’—how is that?”
The master said, “Can you still apprehend it?”
[The monk] said, “Then this stranger has encountered the master!”
The master said, “Better not tell lies.”