It is the 3rd and final day of our retreat. We had been in sitting and walking meditation for two days, and a little before this talk, we turned back from facing the wall to face the center of the room, and right then the waning sun was beaming into the room through a gap in the trees outside. A clear beam of light was crossing the whole space, and in it, all the dust particles of the room were clearly visible, doing their dance in the light…