During this talk, Peter read passages of the Anapanasati Sutta, the discourse on the practice of mindfulness of breathing.  The passages referred to provide training for cultivating vitakka and vicara, aiming attention at the breath and sustaining that awareness.  With practice, awareness  of the sensation of breathing becomes more intimate and persistent, setting the circumstances that support the practice of  vipassana, insight into the characteristics of impermanence, non-self and the consequences of craving and clinging.