Whether it is unlawful to wear divine words at the neck?

Objections

Objection 1 : It would seem that it is not unlawful to wear divine words at the neck. Divine words are no less efficacious when written than when uttered. But it is lawful to utter sacred words for the purpose of producing certain effects; (for instance, in order to heal the sick), such as the "Our Father" or the "Hail Mary," or in any way whatever to call on the Lord's name, according to Mk. 16:17,18, "In My name they shall cast out devils, they shall speak with new tongues, they shall take up serpents." Therefore it seems to be lawful to wear sacred words at one's neck, as a remedy for sickness or for any kind of distress.
Objection 2 : Further, sacred words are no less efficacious on the human body than on the bodies of serpents and other animals. Now certain incantations are efficacious in checking serpents, or in healing certain other animals: wherefore it is written (Ps. 57:5): "Their madness is according to the likeness of a serpent, like the deaf asp that stoppeth her ears, which will not hear the voice of the charmers, nor of the wizard that charmeth wisely." Therefore it is lawful to wear sacred words as a remedy for men.
Objection 3 : Further, God's word is no less holy than the relics of the saints; wherefore Augustine says (Lib. L. Hom. xxvi) that "God's word is of no less account than the Body of Christ." Now it is lawful for one to wear the relics of the saints at one's neck, or to carry them about one in any way for the purpose of self-protection. Therefore it is equally lawful to have recourse to the words of Holy Writ, whether uttered or written, for one's protection.
Objection 4 : On the other hand, Chrysostom says (Hom. xliii in Matth.) [*Cf. the Opus Imperfectum in Matthaeum, among St. Chrysostom's works, and falsely ascribed to him]: "Some wear round their necks a passage in writing from the Gospel. Yet is not the Gospel read in church and heard by all every day? How then, if it does a man no good to have the Gospels in his ears, will he find salvation by wearing them round his neck? Moreover, where is the power of the Gospel? In the shapes of the letters or in the understanding of the sense? If in the shapes, you do well to wear them round your neck; if in the understanding, you will then do better to bear them in your heart than to wear them round your neck."