Nor were the Hebrews without their secret knowledge and their Schools of Initiation. The company of prophets at Naioth presided over by Samuel[37] formed such a School, and the oral teaching was handed down by them. Similar Schools existed at Bethel and Jericho,[38] and in Cruden's _Concordance_[39] there is the following interesting note: "The Schools or Colleges of the prophets are the first [schools] of which we have any account in Scripture; where the children of the prophets, that is, their disciples, lived in the exercises of a retired and austere life, in study and meditation, and reading of the law of God.... These Schools, or Societies, of the prophets were succeeded by the Synagogues." The _Kabbala_, which contains the semi-public teaching, is, as it now stands, a modern compilation, part of it being the work of Rabbi Moses de Leon, who died A.D. 1305. It consists of five books, Bahir, Zohar, Sepher Sephiroth, Sepher Yetzirah, and Asch Metzareth, and is asserted to have been transmitted orally from very ancient times--as antiquity is reckoned historically. Dr. Wynn Westcott says that "Hebrew tradition assigns the oldest parts of the Zohar to a date antecedent to the building of the second Temple;" and Rabbi Simeon ben Jochai is said to have written down some of it in the first century A.D. The Sepher Yetzirah is spoken of by Saadjah Gaon, who died A.D. 940, as "very ancient."[40] Some portions of the ancient oral teaching have been incorporated in the _Kabbala_ as it now stands, but the true archaic wisdom of the Hebrews remains in the guardianship of a few of the true sons of Israel. Brief as is this outline, it is sufficient to show the existence of a hidden side in the religions of the world outside Christianity, and we may now examine the question whether Christianity was an exception to this universal rule. CHAPTER II. THE HIDDEN SIDE OF CHRISTIANITY. _(a)_ THE TESTIMONY OF THE SCRIPTURES. Having seen that the religions of the past claimed with one voice to have a hidden side, to be custodians of "Mysteries," and that this claim was endorsed by the seeking of initiation by the greatest men, we must now ascertain whether Christianity stands outside this circle of religions, and alone is without a Gnosis, offering to the world only a simple faith and not a profound knowledge. Were it so, it would indeed be a sad and lamentable fact, proving Christianity to be intended for a class only, and not for all types of human beings. But that it is not so, we shall be able to prove beyond the possibility of rational doubt.