But Israeli does not seem to have grasped Aristotle's meaning, and ascribes to him the notion that the soul is a separate substance perfecting the natural body, which has life potentially, meaning by this that bodies have life potentially before the soul apprehends them; and when the soul does apprehend them, it makes them perfect and living actually. To be sure, he adds in the immediate sequel that he does not mean temporal before and after, for things are always just as they were created; and that his mode of expression is due to the impossibility of conveying spiritual ideas in corporeal terms in any other way. This merely signifies that the human body and its soul come into being simultaneously. But he still regards them as distinct substances forming only a passing combination. And with this pretended Aristotelian notion he seeks to harmonize that of Plato, which he understands to mean not that the soul enters the body, being clothed with it as with a garment, and then leaves it, but that the soul apprehends bodies by clothing them with its light and splendor, and thus makes them living and moving, as the sun clothes the world with its light and illuminates it so that sight can perceive it. The difference is that the light of the sun is corporeal, and sight perceives it in the air by which it is borne; whereas the light of the soul is spiritual, and intelligence alone can perceive it, not the physical sense. Among the conceptual terms in the Aristotelian logic few play a more important part than those of substance and accident. Substance is that which does not reside in anything else but is its own subject. It is an independent existence and is the subject of accidents. The latter have no existence independent of the substance in which they inhere. Thus of the ten categories, in which Aristotle embraces all existing things, the first includes all substances, as for example, man, city, stone. The other nine come under the genus accident. Quantity, quality, relation, time, place, position, possession, action, passion--all these represent attributes which must have a substantial being to reside in. There is no length or breadth, or color, or before or after, or here or there, and so on except in a real object or thing. This then is the meaning of accident as a logical or ontological term, and in this signification it has nothing to do with the idea of chance. Clearly substance represents the higher category, and accident is inferior, because dependent and variable. Thus it becomes important to know in reference to any object of investigation what is its status in this respect, whether it is substance or accident.