Mumonkan - Case 38: Goso's buffalo

Goso asked,
  "A water buffalo goes out of his 'enclosure.' The head, the horns,
   and the four legs go through, but why doesn't the tail, too?"


Mumon's Comments:

If you can open your one eye (to the question) and say an awakening word,
you will be able to repay the Four Obligations and help the Three Bhava
being saved. If you still have not gotten it, take a close look on the tail
and awake yourself.

   If the buffalo goes through, he will fall into the abyss,
   If he retreats into the enclosure, he will be butchered.
   This little bit of a tail,
   that is a strange thing indeed!

