The signs worked by Jesus attest that the Father has sent him. They invite belief in him. To those who turn to him in faith, he grants what they ask. So miracles strengthen faith in the One who does his Father's works; they bear witness that he is the Son of God. But his miracles can also be occasions for "offence"; they are not intended to satisfy people's curiosity or desire for magic. Despite his evident miracles some people reject Jesus; he is even accused of acting by the power of demons.
MCITL 10th Anniversary: The Catechism and Scriptures together in the Sunday homily
"The integration of elements of the Catechism of the Catholic Church with the readings from the Lectionary offers us an opportunity to demonstrate how the Word of God is able to animate our personal and communal life with Christ and, at the same time, articulate the Church’s faith that has been immeasurably enriched by the living tradition of twenty centuries."-- Archbishop Donald Wuerl, intervention at the Synod of Bishops on the Word of God