Tertullian

“ For by how much you make your god a better and more perfect being, by just so much will all examples be unsuitable to him of that God from whom he totally differs, and without which difference he would not be at all better or more perfect. But then, secondly, you must know that it will not be conceded to you, that in the angels there was only a putative flesh, but one of a true and solid human substance. ”

“ It is more difficult for God to practise deception [4] than to produce real flesh from any material whatever, even without the means of birth. But for other heretics, also, who maintain that the flesh in the angels ought to have been born of flesh, if it had been really human, we have an answer on a sure principle, to the effect that it was truly human flesh, and yet not born. ”

“ Since the Creator “maketh His angels spirits, and His ministers a flame of fire”—as truly spirits as also fire—so has He truly made them flesh likewise; wherefore we can now recall to our own minds, and remind the heretics also, that He has promised that He will one day form men into angels, who once formed angels into men. ”