The treatment of ḥazah “he beheld” (ch. vi.), is followed by the advice that the student should not approach metaphysics otherwise than after a sound and thorough preparation, because a rash attempt to solve abstruse problems brings nothing but injury upon the inexperienced investigator. The author points to the “nobles of the children of Israel” (Exod. xxiv. 11), who, according to his interpretation, fell into this error, and received their deserved punishment. He gives additional force to these exhortations by citing a dictum of Aristotle to the same effect. In a like way he refers to the allegorical use of certain terms by Plato (ch. xvii.) in support of his interpretation of “ẓur” (lit., “rock”) as denoting “Primal Cause.” The theory that nothing but a sound moral and intellectual training would entitle a student to engage in metaphysical speculations is again discussed in the digression which precedes the third group of homonyms (xxxi.–xxxvi.). Man’s intellectual faculties, he argues, have this in common with his physical forces, that their sphere of action is limited, and they become inefficient whenever they are overstrained. This happens when a student approaches metaphysics without due preparation. Maimonides goes on to argue that the non-success of metaphysical studies is attributable to the following causes: the transcendental character of this discipline, the imperfect state of the student’s knowledge, the persistent efforts which have to be made even in the preliminary studies, and finally the waste of energy and time owing to the physical demands of man. For these reasons the majority of persons are debarred from pursuing the study of metaphysics. Nevertheless, there are certain metaphysical truths which have to be communicated to all men, e.g., that God is One, and that He is incorporeal; for to assume that God is corporeal, or that He has any properties, or to ascribe to Him any attributes, is a sin bordering on idolatry.