During this talk, Peter describes controversies and agreements about the role jhana practice has is cultivating vipassana practice.  He explains the progression from “acquiring the nimitta” (a noticeable sensation of touch or light arising from one-pointed concentration on the touch sensation at the nostrils) to the extraordinary state of mind called jhana.  The value of the increased mental acuity from jhana practice to the onset of vipassana practice was explained, compared to the advantages of beginning vipassana practice without first entering jhana (called “dry vipassana).