When the Psychic Being returns back in a new body it also develops a new vital and mental sheath commensurate with its development through the previous life. Whatever helpful vital and mental materials it needed from previous lives gets already integrated into it as the developing psychic personality. Similarly the unfinished lines and curves of evolution are also carried by it as Karmic imprints so as to complete certain ongoing experiences needed for its further evolution. All the rest including our surface personality with which we are so much identified is all left behind, dropped and dissolved into the corresponding cosmic field.
Affectionately,
Alok Da