The flow inside you is enhanced by the repetition of the mantras. Mantras help focus the mind. The Gayatri Mantra is the flow. The mantra activates the flow of the energy up the chakras.
With past life investigation, we have a better understanding of our present lives. Sometimes investigations of past lives brings forward past siddhis and vasanas which help us move forward through our Karma toward further enlightenment.
The discussion of spiritual subjects helps us build friendships as we help each other attain our spiritual goals.