Note 52 — Chapter IV · ToC
Reading edition
Even the Jewish Encyclopedia, and such scholars as Zunz, Graetz, Luzzatto, Jost, and Munk avoid this jungle, as well they might, remembering the legend of the four sages in "the enclosed garden:" one of whom looked around and died; another lost his reason; a third tried to destroy the garden; and only one came out with his wits. See The Cabala, by Pick, and The Kabbalah Unveiled, by MacGregor.