OF ACTUALITY AND POTENTIALITY.
8. What passes from potentiality to actuality, and always remains the same so long as it exists, approaches actuality. It is thus that the bodies such as fire may possess perfection. But what passes from potentiality to actuality cannot exist always, because it contains matter. On the contrary, what exists actually, and what is simple, exists always. Besides, what is actual may also in certain respects exist potentially.