During the fourth night talk, Peter described the “mind conditioners” that the Anapanasati Sutta trains to calm with mindfulness of breathing.  He described the 14 wholesome conditioners, with particular attention to the “beautiful pairs” of conditioners (describing the pairing of mind and mind conditioners), tranquility, lightness/agility, pliancy, wieldiness, proficiency and uprightness.  These 14 conditioners combine with other “universal” and “occasional” mind conditioners in every moment of wholesome self-state organization.