"A crucially vital work in the long history of Jewish esoteric spirituality. Aside from its intrinsic importance, the book's influence has been enormous, and is likely to continue all but indefinitely."--Harold Bloom, Yale University
"Major Trends [is] the canonical modern work on the nature and history of Jewish mysticism. For a sophisticated understanding, not only of the dynamics of Jewish mysticism, but of the exquisite complexities of Jewish history and tradition, Major Trends is a major port of entry through which one must pass."--Yosef Hayim Yerushalmi, Columbia University