Light to live by

My mother is a Quaker. I have been going to Quaker Meeting for Worship (or "Meeting") once in a while since I was a child. Recently she lent me a book about Quaker meditation, called Light To Live By. It shows a way to use the visualizing light as a way to heal inner pain. I found it useful in Meeting as well as by myself while looking within, or what I call self-therapy.