9. (14). It is absolutely necessary to postulate the existence of a nature different from bodies, by itself fully possessing genuine existence, which can neither be born nor perish. Otherwise, all other things would hopelessly disappear, as a result of the destruction of the existence which preserves both the individuals and the universe, as their beauty and salvation. The soul, indeed, is the principle of movement (as Plato thought, in the Phaedrus); it is the soul that imparts movement to everything else; the soul moves herself. She imparts life to the body she animates; but alone she possesses life, without ever being subject to losing it, because she possesses it by herself. All beings, indeed, live only by a borrowed life; otherwise, we would have to proceed from cause to cause unto infinity. There must, therefore, exist a nature that is primarily alive, necessarily incorruptible and immortal because it is the principle of life for everything else. It is thereon that must be founded all that is divine and blessed, that lives and exists by itself, that lives and exists supremely, which is immutable in its essence, and which can neither be born nor perish. How indeed could existence be born or perish? If the name of "existence" really suited it, it must exist forever, just as whiteness is not alternately black and white. If whiteness were existence itself, it would, with its "being" (or nature) (which is, to be whiteness), possess an eternal existence; but, in reality, it is no more than whiteness. Therefore, the principle that possesses existence in itself and in a supreme degree will always exist. Now this primary and eternal existence can not be anything dead like a stone, or a piece of wood. It must live, and live with a pure life, as long as it exists within itself. If something of it mingles with what is inferior, this part meets obstacles in its aspiration to the good; but it does not lose its nature, and resumes its former condition on returning to a suitable condition (as thought Plato, in his Phaedo[81]). THE SOUL IS INCORPOREAL BECAUSE OF HER KINSHIP WITH THE DIVINE.