In this wide-ranging discussion of Kabbalah - from the mystical trends of medieval Judaism to modern Hasidism - one of the world's foremost scholars considers different visions of the nature of the sacred text and the methods used to interpret it. Moshe Idel takes as a starting point the fact that the postbiblical Jewish world lost its geographical center with the destruction of the Temple and so was left with a textual center, the Holy Book. Idel argues that a text-oriented religion produced language-centered forms of mysticism.