The account of the Creation given in the book of Genesis is explained by the author according to the following two rules: First its language is allegorical; and, Secondly, the terms employed are homonyms. The words erez, mayim, ruaḥ, and ḥoshek in the second verse (ch. i.), are homonyms and denote the four elements: earth, water, air, and fire; in other instances erez is the terrestrial globe, mayim is water or vapour, ruaḥ denotes wind, and ḥoshek darkness: According to Maimonides, a summary of the first chapter may be given thus; God created the Universe by producing first the reshit the "beginning" (Gen. 1:1), or hatḥalah, i.e., the intellects which give to the spheres both existence and motion, and thus become the source of the existence of the entire Universe. At first this Universe consisted of a chaos of elements, but its form was successively developed by the influence of the spheres, and more directly by the action of light and darkness, the properties of which were fixed on the first day of the Creation. In the subsequent five days minerals, plants, animals, and the intellectual beings came into existence. The seventh day, on which the Universe was for the first time ruled by the same natural laws which still continue in operation, was distinguished as a day blessed and sanctified by the Creator, who designed it to proclaim the creatio ex nihilo (Exod. xx. xi). The Israelites were moreover commanded to keep this Sabbath in commemoration of their departure from Egypt (Deut. v. ii), because during the period of the Egyptian bondage, they had not been permitted to rest on that day. In the history of the first sin of man, Adam, Eve, and the serpent represent the intellect, the body, and the imagination. In order to complete the imagery, Samael or Satan, mentioned in the Midrash in connexion with this account, is added as representing man's appetitive faculties. Imagination, the source of error, is directly aided by the appetitive faculty, and the two are intimately connected with the body, so which man generally gives paramount attention, and for the sake of which he indulges in sins; in the end, however, they subdue the intellect and weaken its power. Instead of obtaining pure and real knowledge, man forms false conceptions; in consequence, the body is subject to suffering, whilst the imagination, instead of being guided by the intellect and attaining a higher development becomes debased and depraved. In the three sons of Adam, Kain, Abel, and Seth, Maimonides finds an allusion to the three elements in man: the vegetable, the animal, and the intellectual. First, the animal element (Abel) becomes extinct; then the vegetable elements (Kain) are dissolved; only the third element, the intellect (Seth), survives, and forms the basis of mankind (ch. xxx., xxxi.).