brought only about certain changes in the prayer—such as the substitution of ‏מן העולם ועד העולם‎ for ‏עד עילם‎ in the responses of the congregation during the public service, in order to establish the belief in the existence of another world and another life beyond the grave. The necessity of formulating the principles of faith arose when the contact and intercourse with other religious communities gave frequent occasion to discussions on these and similar subjects. Without some fixed basis, it was feared, disorder and confusion would disturb the peace in the camp of Israel. Thus Saadiah says in Emunoth Ve-deoth: “I have seen men drowned, as it were, in the sea of doubts, covered by the waves of error, and there was no diver to bring them up from the depth, nor any swimmer to take hold of them and draw them out. As I possessed enough of what God taught me to support them, and had the power for upholding them granted to me, I considered it my duty to assist and guide my fellow-men according to the best of my abilities.” In ten chapters Saadiah discusses the various theological problems, and defends the following articles of faith: Existence of God; His Unity; Revelation; Free-will; Immortality of the Soul; Resurrection of the Dead; Final Redemption of Israel; Reward and Punishment. Although these principles do not seem to have been shaped into the form of a solemn declaration or embodied in the prayer, they are treated as themes familiar to the reader, and as elements essential in the Jewish faith (‏אשר אנחנו מחויבים להאמין‎). Rabbi Abraham ben David (Rabad, ‏רא״בד‎), in his Haemunah haramah (“The Lofty Faith”), seems to assume three principles: Existence of God, Prophecy, and Reward and Punishment, which to defend from the attacks of the unbeliever, he considers as the first duty of the Jewish scholar (‏התורני‎); but he does not follow this decision in his book. He comprises all religious truths which he has to demonstrate under six heads (‏עיקרים‎). The first of them he calls “Root of the faith;” it expresses the conviction that all things in the universe owe their existence to a “First Cause”—God. Next comes “Unity of God,” which is followed by “Attributes of God,” “The intermediate causes of natural changes.” “Prophecy”—or ‏האמונה האחרונה‎, “the subsequent belief,” i.e., the belief which follows the belief in God—and “Divine Providence.”