The student will sit in a comfortable position. In this exercise, the student will try to relive his past lives, scenes from his past existences.
For this purpose, he will activate his lung chakras by vocalizing the mantra CHAS. He will vocalize this mantra for about 20 minutes to half an hour, in this way:
The key to remembering past lives is in the retrospection exercise.
The disciple, immersed in deep meditation, should make a retrospective recapitulation of all events that have occurred in our life from present to past.
The disciple should try to remember all events that have occurred in reverse order, starting from the last ones until he remembers the first events of his childhood.
We can remember all memories of our childhood by practicing the retrospective exercise during moments of falling asleep.
At those moments we can strive for remembering the last experiences of our past reincarnation, and so, in a retrospective order, we can review all our past and previous reincarnations.
The important thing is to practice this retrospective exercise at moments of falling asleep. In this way, in dream vision, we will remember all our past lives.
Samael Aun Weor
Manual of Practical Magic