Hekiganroku - Case 57: Joshu and the "Bumpkin"

A monk asked Joshu,
  "'The supreme Way is not difficult; it simply dislikes choosing'. What
   is non-choosing?"
Joshu said,
  "Above the heavens and under the heavens I am the only one, alone and
   exalted."
The monk said,
  "That is still choosing."
Joshu said,
  "You stupid bumpkin, where is the choosing?"
The monk remained silent.

