According to St Paul, Satan can even change himself into an angel of light in order to practice his deceptions (cf 2 Cor. 11:14); yet though he may manifest himself in such a glorious manner, he cannot, as we said, produce within us the effects of grace, and so it becomes quite clear that the vision is counterfeit. For the devil cannot bring about love either for God or for one's neighbor, or gentleness, or humility, or joy, or peace, or equilibrium in one's thoughts, or hatred of the world, or spiritual repose, or desire for celestial things; nor can he quell passions and sensual pleasure.
