This dialogue describes piti (joy) and sukkha (happiness) as the result of increasing concentration, due to the setting aside of the hindrances.  Once the energy of consciousness isn’t “dumped” into the hindrances, the mind naturally becomes buoyant, resilient and interested in investigating what has arisen in awareness.  Rapture, a potent manifestation of joy, develops in stages as the mind moves into the extraordinary levels called jhana, which will be discussed the next few meetings.