AS Marilyn said - There is often a reason that images from the past come forward. So long as there is no negative emotion, there's no problem.
Another way to look at it is that your imagination creates images from seed data that you carry around as part of your definition of self. Past life experiences are often very good seeds.
When problems occur, for example finding that the dream always ended as you were devoured by a leopard, or severe nightmares about being dropped into a volcano, (both of which I've encountered in my work) then that suggests unfinished business that might eventually creep into the present. Conversely, recollections of being crowned King of the Tribe, or of being a monk with amazing spiritual powers, suggests connections of a more positive sort that previously were restrained, but now are burgeoning forth to bring new life.
Of you have a couple friends who are interested in this tpe of thing, I have a very brief "How-To" for past life regression using hypnotic methods on my web site at
www.mbs-hypnoclinic.com. It's perfectly safe, so long as you are respectful. In the same way, methods that Bruce advises (as in Book 5) can be turned into past life excursions. If you feel concerned, I suggest reclling Plato's words, "No harm comes to a Good Man."
love-
dave