Scripture teaches that God acts through relics, especially in terms of healing. In fact, when surveying what Scripture has to say about sacred relics, one is left with the idea that healing is what relics "do."
God has brought about a healing using a material object. The vehicle for the healing was the touching of that object. It is very important to note, however, that the cause of the healing is God; the relics are a means through which He acts. In other words, relics are not magic. They do not contain a power that is their own; a power separate from God. Any good that comes about through a relic is God's doing. But the fact that God chooses to use the relics of saints to work healing and miracles tells us that He wants to draw our attention to the saints as "models and intercessors" (Catechism of the Catholic Church, 828).