We have already mentioned that these theories are not opposed to anything taught by our Prophets or by our Sages. Our nation is wise and perfect, as has been declared by the Most High, through Moses, who made us perfect: “Surely this great nation is a wise and understanding people” (Deut. iv. 6). But when wicked barbarians have deprived us of our possessions, put an end to our science and literature, and killed our wise men, we have become ignorant; this has been foretold by the prophets, when they pronounced the punishment for our sins: “The wisdom of their wise men shall perish, and the understanding of their prudent men shall be hid” (Isa. xxix. 14). We are mixed up with other nations; we have learnt their opinions, and followed their ways and acts. The Psalmist, deploring this imitation of the actions of other nations, says, “They were mingled among the nations, and learned their works” (Ps. cvi. 35). Isaiah likewise complains that the Israelites adopted the opinions of their neighbours, and says, “And they please themselves in the children of strangers” (Isa. ii. 6); or, according to the Aramaic version of Jonathan, son of Uzziel, “And they walk in the ways of the nations.” Having been brought up among persons untrained in philosophy, we are inclined to consider these philosophical opinions as foreign to our religion, just as uneducated persons find them foreign to their own notions. But, in fact, it is not so. Since we have repeatedly spoken of the influence emanating from God and the Intelligences, we will now proceed to explain what is the true meaning of this influence, and after that I will discuss the theory of the Creation. CHAPTER XII It is clear that whenever a thing is produced, an efficient cause must exist for the production of the thing that has not existed previously. This immediate efficient cause is either corporeal or incorporeal; if corporeal, it is not the efficient cause on account of its corporeality, but on account of its being an individual corporeal object, and therefore by means of its form. I will speak of this subject later on. The immediate efficient cause of a thing may again be the effect of some cause, and so on, but not ad infinitum. The series of causes for a certain product must necessarily conclude with a First Cause, which is the true cause of that product, and whose existence is not due to another cause. The question remains, Why has this thing been produced now and not long before, since the cause has always been in existence? The answer is, that a certain relation between cause and product has been absent, if the cause be corporeal; or, that the substance has not been sufficiently prepared, if the cause be incorporeal. All this is in accordance with the teachings of natural science. We ignore for the present the question whether to assume the Eternity of the Universe, or the Creatio ex nihilo. We do not intend to discuss the question here.