Secondly, the benedictions or charms must contain no unknown names; for according to S. John Chrysostom such are to be regarded with fear, lest they should conceal some matter of superstition.
Thirdly, there must be nothing in the words that is untrue; for if there is, the effect of them cannot be from God, Who is not a witness to a lie. But some old women in their incantations use some such jingling doggerel as the following:
Blessed Mary went a-walking
Over Jordan river.
Stephen met her, and fell a-talking, etc.
Fourthly, there must be no vanities, or written characters beyond the sign of the Cross. Therefore the charms which soldiers are wont to carry are condemned.
Fifthly, no faith must be placed in the method of writing or reading or binding the charm about a person, or in any such vanity, which has nothing to do with the reverence of God, without which a charm is altogether superstitious.
Sixthly, in the citing and uttering of Divine words and of Holy Scripture attention must only be paid to the sacred words themselves and their meaning, and to the reverence of God; whether the effect be looked for from the Divine virtue, or from the relics of Saints, which are a secondary power, since their virtue springs originally from God.
Seventhly, the looked-for effect must be left to the Divine Will; for He knows whether it is best for a man to be healed or to be plagued, or to die. This condition was set down by S. Thomas.
So we may conclude that if none of these conditions be broken, the incantation will be lawful. And S. Thomas writes in this connection on the last chapter of S. Mark: And these signs shall follow them that believe; in my name shall they cast out devils; they shall take up serpents. From this it is clear that, provided the above conditions are observed, it is lawful by means of sacred words to keep serpents away.
S. Thomas says further: The words of God are not less holy than the Relics of the Saints. As S. Augustine says: The word of God is not less than the Body of Christ. But all are agreed that it is lawful to carry reverently about the person the Relics of the Saints: therefore let us by all means invoke the name of God by duly using the Lord’s Prayer and the Angelic Salutation, by His Birth and Passion, by His Five Wounds, and by the Seven Words which He spoke on the Cross, by the Triumphant Inscription, by the three nails, and by the other weapons of Christ’s army against the devil and his works. By all these means it is lawful to work, and our trust may be placed in them, leaving the issue to God’s will.
And what has been said about the keeping off of serpents applies also to other animals, provided that the attention is fixed only on the sacred words and the Divine virtue. But great care is to be used in incantations of this nature. For S. Thomas says: Such diviners often use unlawful observances, and obtain magic effects by means of devils, especially in the case of serpents; for the serpent was the devil’s first instrument by which he deceived mankind.
For in the town of Salzburg there was a certain mage who one day, in open view of all, wanted to charm all the snakes into a particular pit, and kill them all within an area of a mile. So he gathered all the snakes together, and was himself standing over the pit, when last of all there came a huge and horrible serpent which would not go into the pit. This serpent kept making signs to the man to let it go away and crawl where it would; but he would not cease from his incantation, but insisted that, as all the other snakes had entered the pit and there died, so also must this horrible serpent. But it stood on the opposite side to the warlock, and suddenly leapt over the pit and fell upon the man, wrapping itself round his belly, and dragged him with itself into the pit, where they both died. From this it may be seen that only for a useful purpose, such as driving them away from men’s houses, are such incantations to be practised, and they are to be done by the Divine virtue, and in the fear of God, and with reverence.
In the second place we have to consider how exorcisms or charms of this kind ought to be used, and whether they should be worn round the neck or sewn into the clothing. It may seem that such practices are unlawful; for S. Augustine says, in the Second Book on the Christian Doctrine: There are a thousand magic devices and amulets and charms which are all superstitious, and the School of Medicine utterly condemns them all, whether they are incantations, or certain marks which are called characters, or engraved charms to be hung round the neck.
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