Section 25
On the Divine Names · Pseudo-Dionysius the Areopagite
But neither is the Evil in irrational creatures, for if you should take away anger and lust, and the other things which we speak of, and which are not absolutely evil in their own nature, the lion having lost his boldness and fierceness will not be a lion; and the dog, when he has become gentle to every body, will not be a dog, since to keep guard is a dog's duty, and to admit those of the household, but to drive away the stranger. So the fact that nature is not destroyed is not an evil, but a destruction of nature, weakness, and failure of the natural habitudes and energies and powers. And, if all things through generation in time have their perfection, the imperfect is not altogether contrary to universal nature.
PdDN 4.25.1