WHAT IS BEING IN THE INTELLIGIBLE IS GENERATION IN THE SENSE-WORLD.
2. First let us consider what mundane name "Being" must be applied to. To begin with, it must be explained that physical nature can receive the name of "being" only as a figure of speech;[343] or rather, should not receive it at all, since it implies the idea of perpetual flowing (that is, change[349]); so, the more suitable denomination would be "generation."[350] We shall also have to acknowledge that the things that belong to generation are very different; nevertheless all bodies, some simple (such, as elements), the others composite as mixtures), together with their accidents and effects, must, during the process of classification, be reduced to a single genus.
In bodies, one may besides distinguish on one hand matter, on the other, the form imprinted thereon; and we designate each of these separately as a genus, or subsume both under a unity, inasmuch as we designate both by the common label[343] of "being," or rather, "generation." But what is the common element in matter and form? In what manner, and of what is matter a genus? For what difference inheres in matter? In what sequence could we incorporate that which is composed of both? But in the case that that which is composed of both be itself corporeal being, while neither of the two is a body, how then could either be incorporated in a single genus, or within the same genus along with the compound of both? How (could this incorporation into a single genus be effected with) the elements of some object and the object itself? To answer that we should begin by the (composite) bodies: which would be tantamount to learning to read by beginning with syllables (and not with letters).