Hekiganroku: Ummon's "No Preaching on Oneness"

In this Teisho, given on January 9, 2021, Rinzan Pechovnik Osho examines "The Blue Cliff Record, Case 15: Ummon's "No Preaching on Oneness." There is only one thing, all things. Going beyond even notions of stillness and oneness, how do we manifest this great reality?