Here are notes from Father Thomas Keating's four conferences with the advanced Centering Prayer retreat group at Snowmass, Co. in November, 2000  
  Nov. 4, 2000 The Inner Room, and Deep Knowledge of God  
  Nov. 5, 2000 Developing the "Promptitude of Letting Go"  
  Nov. 6, 2000 The nature of the Kingdom of God  
  Nov. 8, 2000 Night of Sense, Night of Spirit, Night of Self