袁州仰山慧寂禪師語錄 1.54

1.54

When the Master was residing at Dongping, Guishan sent a monk to deliver a letter along with a mirror to the Master. The Master ascended the hall, held it up to show the assembly, and said, "Tell me, is it Guishan's mirror or Dongping's mirror? If you say it is Dongping's mirror, it was sent by Guishan; if you say it is Guishan's mirror, it is in Dongping's hands. If you can speak, I will keep it; if you cannot speak, I will smash it to pieces." The assembly was silent. The Master then smashed it and stepped down from the seat. (Wuzu Jie said, "Ask the Upādhyāya to explain the principle further." He suddenly snatched it and broke it.)