But you do not believe, because you are not among my sheep.
-- Jn 10:22-30
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.
-- CCC 548