Against Celsus 4.92

In our view, certain wicked demons, of the Titanic or Gigantic kind, if I may so call them, who have become impious toward what is truly divine and toward the angels in heaven, and have fallen from heaven and roll about the grosser and unclean bodies on earth, having some power of discerning the future, since they are bare of earthly bodies, and occupying themselves with this kind of work, wishing to lead the human race away from the true God, slip into the more rapacious and savage animals and others that are more cunning, and move them to whatever they wish, when they wish; or they turn the impressions of such animals toward such flights and movements, so that human beings, caught by the divination in irrational animals, may not seek the God who encompasses the universe, nor examine pure worship of God, but may fall in their reasoning to the earth, and to birds and serpents, and even to foxes and wolves. For it has been observed by those skilled in these matters that the clearer foreknowledge comes through such animals, since the demons cannot do as much in the tamer animals as they can, because of the likeness of vice (not vice, but something like vice) in such animals, to make these animals act.