Part of a continuing series.
A selected quote from the Catechism of the Catholic Church in honor of the Year of Faith (October 11, 2012 - November 24, 2013)
142 By his Revelation, "the invisible God, from the fullness of his love, addresses men as his friends, and moves among them, in order to invite and receive them into his own company." The adequate response to this invitation is faith.
143 By faith, man completely submits his intellect and his will to God. With his whole being man gives his assent to God the revealer. Sacred Scripture calls this human response to God, the author of revelation, "the obedience of faith".
148 The Virgin Mary most perfectly embodies the obedience of faith. By faith Mary welcomes the tidings and promise brought by the angel Gabriel, believing that "with God nothing will be impossible" and so giving her assent: "Behold I am the handmaid of the Lord; let it be [done] to me according to your word." Elizabeth greeted her: "Blessed is she who believed that there would be a fulfillment of what was spoken to her from the Lord." It is for this faith that all generations have called Mary blessed.
149 Throughout her life and until her last ordeal when Jesus her son died on the cross, Mary's faith never wavered. She never ceased to believe in the fulfillment of God's word. And so the Church venerates in Mary the purest realization of faith.
150 Faith is first of all a personal adherence of man to God. At the same time, and inseparably, it is a free assent to the whole truth that God has revealed. As personal adherence to God and assent to his truth, Christian faith differs from our faith in any human person. It is right and just to entrust oneself wholly to God and to believe absolutely what he says. It would be futile and false to place such faith in a creature.
151 For a Christian, believing in God cannot be separated from believing in the One he sent, his "beloved Son", in whom the Father is "well pleased"; God tells us to listen to him. The Lord himself said to his disciples: "Believe in God, believe also in me." We can believe in Jesus Christ because he is himself God, the Word made flesh: "No one has ever seen God; the only Son, who is in the bosom of the Father, he has made him known." Because he "has seen the Father", Jesus Christ is the only one who knows him and can reveal him.
152 One cannot believe in Jesus Christ without sharing in his Spirit. It is the Holy Spirit who reveals to men who Jesus is. For "no one can say "Jesus is Lord", except by the Holy Spirit", who "searches everything, even the depths of God. . No one comprehends the thoughts of God, except the Spirit of God." Only God knows God completely: we believe in the Holy Spirit because he is God.
The Church never ceases to proclaim her faith in one only God: Father, Son and Holy Spirit.