The Gateless Gate/Shuzan's Short Staff
Shuzan held out his short staff and said: "If you call this a short staff, you oppose its reality. If you do not call it a short staff, you ignore the fact. Now what do you wish to call this?"

 Mumon’s comment: If you call this a short staff, you oppose its reality. If you do not call it a short staff, you ignore the fact. It cannot be expressed with words and it cannot be expressed without words. Now say quickly what it is.
 Holding out the short staff,
 He gave an order of life or death.
 Positive and negative interwoven,
 Even Buddhas and patriarchs cannot escape this attack.