One day Te-shan gave a sermon, in which he said, “When you question, you commit a fault.  When you do not, you give offense.”  
     A monk came forward and began to bow, whereupon the master struck him.
     “I have just begun my bowing!” said the monk.  “Why did you strike me?”
     “If I wait for you to open your mouth, all will be over.”

ZEN MONDO