28. Every begotten thing derives the cause of its generation from some other (being); for nothing is begotten causelessly. But, among begotten things, those which owe their being to a union of elements are on that very account perishable. As to those which, not being composite, owe their being to the simplicity of their hypostatic substances, they are imperishable, inasmuch as they are indissoluble. When we say that they are begotten, we do not mean that they are composite, but only that they depend on some cause. Thus bodies are begotten doubly, first because they depend on a cause, and then because they are composite. Souls and intelligence, indeed, are begotten in the respect that they depend on a cause; but not in the respect that they are composite. Therefore, bodies, being doubly begotten, are dissoluble and perishable. The Soul and Intelligence, being unbegotten in the sense that they are not composite, are indissoluble and imperishable; for they are begotten only in the sense that they depend on a cause. 29. Every principle that generates, by virtue of its "being," is superior to the product it generates. Every generated being naturally turns towards its generating principle. Of the generating principles, some (the universal and perfect substances) do not turn towards their product; while others (the substances that are individual, and subject to conversion towards the manifold) partly turn towards their product, and remain partly turned towards themselves; while others entirely turn towards their product, and do not turn at all towards themselves. OF THE RETURN OF BEINGS TO THE FIRST.