The tetragrammaton exclusively expresses the essence of God, and therefore it is employed as a nomen proprium. In the mystery of this name, and others mentioned in the Talmud, as consisting of twelve and of forty-two letters, Maimonides finds no other secret than the solution of some metaphysical problems. The subject of these problems is not actually known, but the author supposes that it referred to the “absolute existence of the Deity.” He discovers the same idea in ehyeh (Exod. iii. 14), in accordance with the explanation added in the Sacred Text: asher ehyeh, “that is, I am.” In the course of this discussion he exposes the folly or sinfulness of those who pretend to work miracles by the aid of these and similar names. With a view of preparing the way for his peculiar interpretation of rokeb baʻarabot, he explains a variety of Scriptural passages, and treats of several philosophical terms relative to the Supreme Being. Such expressions as “the word of God,” “the work of God,” “the work of His fingers,” “He made,” “He spake,” must be taken in a figurative sense; they merely represent God as the cause that some work has been produced, and that some person has acquired a certain knowledge. The passage, “And He rested on the seventh day” (Exod. xx. 11) is interpreted as follows: On the seventh Day the forces and laws were complete, which during the previous six days were in the state of being established for the preservation of the Universe. They were not to be increased or modified. It seems that Maimonides introduced this figurative explanation with a view of showing that the Scriptural “God” does not differ from the “Primal Cause” or “Ever-active Intellect” of the philosophers. On the other hand, the latter do not reject the Unity of God, although they assume that the Primal Cause comprises the causa efficiens, the agens, and the causa finalis (or, the cause, the means, and the end); and that the Ever-active Intellect comprises the intelligens, the intellectus, and the intellectum (or, the thinking subject, the act of thought, and the object thought of); because in this case these apparently different elements are, in fact, identical. The Biblical term corresponding to “Primal Cause” is rokeb baʻarabot, “riding on ʻarabot.” Maimonides is at pains to prove that ʻarabot denotes “the highest sphere,” which causes the motion of all other spheres, and which thus brings about the natural course of production and destruction. By “the highest sphere” he does not understand a material sphere, but the immaterial world of intelligences and angels, “the seat of justice and judgment, stores of life, peace, and blessings, the seat of the souls of the righteous,” etc. Rokeb baʻarabot, therefore, means: He presides over the immaterial beings, He is the source of their powers, by which they move the spheres and regulate the course of nature. This theory is more fully developed in the Second Part.