Origen

“ But, indeed, human nature is never utterly forsaken by God and His only-begotten Son, the Truth. Wherefore even Celsus spoke the truth when he made the demons take pleasure in the blood and smoke of victims; although, by the force of his own evil nature, he falls back into his errors, and compares demons with men who rigorously discharge every duty, even to those who show no gratitude; while to those who are grateful they abound in acts of kindness. ”