The National Inititiave for Adolescent Catechesis

Faith is a personal act - the free response of the human person to the initiative of God who reveals himself. But faith is not an isolated act. No one can believe alone, just as no one can live alone. You have not given yourself faith as you have not given yourself life. The believer has received faith from others and should hand it on to others.

from Catechism of the Catholic Church - 166