Kabbalah

Books on Kabbalah being distributed somewhere on Second Avenue...last mention I hear of Kabbalah was when it was Madonna's latest enthusiasm ( taking the place of yoga, as I remember).

A bit from the internet:

Kabbalah/Kabala (Hebrew: קַבָּלָה‎ lit. "receiving"; often contemporary transliteration with a 'K' distinguishes from other, derivative traditions outside Judaism)^{[citation needed]} is a discipline and school of thought concerned with the esoteric aspect of Rabbinic Judaism. It was systematized in 11th-13th century Hachmei Provence (Southern France) and Spain, and again after the Expulsion from Spain, in 16th century Ottoman Palestine. It was popularized in the form of Hassidic Judaism in the 18th century.
Kabbalah is a set of esoteric teachings meant to explain the relationship between an eternal and mysterious Creator and the mortal and finite universe (His creation). While it is heavily used by some denominations, it is not a denomination in and of itself; it is a set of scriptures that exist outside the traditional Jewish scriptures. Kabbalah seeks to define the nature of the universe and the human being, the nature and purpose of existence, and various other ontological questions. It also presents methods to aid understanding of these concepts and to thereby attain spiritual realization. Kabbalah originally developed entirely within the realm of Jewish thought and constantly uses classical Jewish sources to explain and demonstrate its esoteric teachings. These teachings are thus held by kabbalists to define the inner meaning of both the Tanakh (Hebrew Bible) and traditional rabbinic literature, their formerly concealed transmitted dimension, as well as to explain the significance of Jewish religious observances.^[1]