„Esaias says: “The wolf also shall feed with the lamb, and the leopard shall take his rest with the kid; the calf also, and the bull, and the lion shall eat together; and a little boy shall lead them. …” I am quite aware that some persons endeavour to refer these words to the case of savage men, both of different nations and various habits, who come to believe, and when they have believed, act in harmony with the righteous. But although this is [true] now with regard to some men coming from various nations to the harmony of the faith, nevertheless in the resurrection of the just [the words shall also apply] to those animals mentioned. For God is rich in all things. And it is right that when the creation is restored, all the animals should … revert to the food originally given by God … that is, the productions of the earth.“
Book 5, Chapter 33, Section 4. Translated by Philip Schaff et al. (full text at Wikisource).