I love this little book. It is a wonderful introduction to the Buddhist understanding of the development of the ego. Worth taking time to really relax into a felt understanding of what he is laying out. There is no one like ChÖgyam Trungpa Rimpoche to help our western mind grasp foundational Buddhist science.
Inner Space: Introduction to Kabbalah, Meditation and Prophecy
Brilliant and readable rendition of Jewish mystical thinking from a master.