Tertullian

“ As spiritual, they can do no harm; for, invisible and intangible, we are not cognizant of their action save by its effects, as when some inexplicable, unseen poison in the breeze blights the apples and the grain while in the flower, or kills them in the bud, or destroys them when they have reached maturity ”

“ Plato also admits the existence of angels. The dealers in magic, no less, come forward as witnesses to the existence of both kinds of spirits. We are instructed, moreover, by our sacred books how from certain angels, who fell of their own free-will, there sprang a more wicked demon-brood, condemned of God along with the authors of their race, and that chief we have referred to. It will for the present be enough, however, that some account is given of their work. Their great business is the ruin of mankind. ”

“ Every spirit is possessed of wings. This is a common property of both angels and demons. So they are everywhere in a single moment; the whole world is as one place to them; all that is done over the whole extent of it, it is as easy for them to know as to report. Their swiftness of motion is taken for divinity, because their nature is unknown. ”

“ They inflict, accordingly, upon our bodies diseases and other grievous calamities, while by violent assaults they hurry the soul into sudden and extraordinary excesses. Their marvellous subtleness and tenuity give them access to both parts of our nature. ”

“ From dwelling in the air, and their nearness to the stars, and their commerce with the clouds, they have means of knowing the preparatory processes going on in these upper regions, and thus can give promise of the rains which they already feel. ”