At the time of
Sixth Patriarch, there were no koans.
Only Sung Dynasty, then koan study started. If koan study is
only way to study Buddhism, the Sixth Patriarch or Bodhidharma are not Zen
masters [laughs, laughter]. -------------------------------- Excerpt from Shunryu Suzuki lecture - 68-07-21 as found on shunryusuzuki.com. Edited by DC