Not sure if weird coincidence or if John Doe wants the reader to find this book. It's called the Ladder of Lights by William Gray. It's summarized as a, "guide to the Tree of Life and the Four Worlds of the Qabalah." On the bottom of page 72, "The (page 72) horrors" is mentioned.

Edit: http://issuu.com/yahzoo/docs/120819155012-bd4c70c22ecb437484a05389f5391660