This is a book of the key text of the Kabbalah, a work known as the Zohar ("Splendour"). The Zohar is a commentary on the Torah and although it is sometimes ascribed to a second-century rabbi, Simon Bar-Yochai, the form in which it is most widely known originates with Moses of Leon, a native of Granada, who died in 1305.The kabbalists believe that the undefinable origin of all things is Ein Sof - the cause of causes, the infinite, that which underlies...