On the Giants (6-7)

"And when the angels of God saw the daughters of men that they were beautiful, they took unto themselves wives of all of them whom they chose." [*] Those beings, whom other philosophers call demons, Moses usually calls angels; and they are souls hovering in the air.

And let no one suppose, that what is here stated is a fable, for it is necessarily true that the universe must be filled with living things in all its parts, since every one of its primary and elementary portions contains its appropriate animals and such as are consistent with its nature; —the earth containing terrestrial animals, the sea and the rivers containing aquatic animals, and the fire such as are born in the fire (but it is said, that such as these last are found chiefly in Macedonia), and the heaven containing the stars: