Abelsons "Jewish Mysticism" remains, to this day, over a century after its manufacture, one of the most comprehensive works on the subject ever written. Covering the Yetzirah, Kabbalah in general, content from the Zohar, and much more, it also provides a large bibliography. For one of the most complex occult systems, Abelson has crafted a work that is at once expansive and yet understandable by those who have little spiritual training in the topic.