Augustine of Hippo

(ubi sup.) For He was known to them in that degree in which He wished to be known; and He wished as much as was fitting. He was not known to them as to the holy Angels, who enjoy Him by partaking of His eternity according as He is the Word of God; but as He was to be made known in terror, to those beings from whose tyrannical power He was about to free the predestinate. He was known therefore to the devils, not in that He is eternal Life, but by some temporal effects of His Power, which might be more clear to the angelic senses of even bad spirits than to the weakness of men.