John Chrysostom
Do you seek liberation from evil spirits? If these spirits were able to overpower swine and cast them into the sea when Christ permitted their entrance, will they show mercy towards humanity? Consider, if they had not brought death upon mankind or conspired against him! They expelled him from the Garden of Eden and stripped him of divine glory; will they truly heal his mortal frame? This notion is absurd and deceptive. Evil spirits are agents of intrigue and destruction, not healing. They are relentless in their pursuit of the soul; do you believe they will care for the body? Seek to drive humanity from grace, and do you think they wish to alleviate his afflictions? Have you not heard the prophet, or rather God speaking through him, declare that they cannot perform either good or evil?
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Even if they could and intended to heal, which is impossible, would you risk eternal ruin for a fleeting gain? Do you wish to mend the body at the expense of the soul? This profit is hollow: you appeal to your adversaries for bodily restoration, while provoking the Lord who fashioned the human form! Is it not simple for a malevolent individual, through his medical craft, to lead you towards the worship of false gods? The heathens have often succeeded in treating various ailments and restoring health through their practices. But does that mean we should engage in their sinful ways? Certainly not. Reflect on what Moses conveyed to the Israelites: "But if there arise in thee a prophet, or a man that seeth a dream, and shall give thee a sign or a wonder, and a sign or a wonder shall come unto thee, saying, Come, let us serve other gods, which thou knowest not: lest thou hearken not unto the saying of that prophet, or that man that seeth that dream." The meaning of these words is this: if a prophet emerges and performs miracles—such as raising the dead, cleansing lepers, or healing the afflicted—and afterward leads you towards iniquity, do not trust him merely because of the miracle he accomplished. Why? "Thou shalt not tempt the Lord thy God, to lead you away, but if you love the Lord your God with all your heart and with all your soul." Thus, it is evident that demons do not provide healing. If at times, by divine allowance, they perform some healing—similar to human agents—such permission is a trial for you, not because God is unaware of your heart but so you may learn not to accept healing from those evil spirits.