Catechism of the Catholic Church
166 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. Our love for Jesus and for our neighbour impels us to speak to others about our faith. Each believer is thus a link in the great chain of believers. I cannot believe without being carried by the faith of others, and by my faith I help support others in the faith.
167 "I believe" (Apostles' Creed) is the faith of the Church professed personally by each believer, principally during Baptism. "We believe" (Niceno-Constantinopolitan Creed) is the faith of the Church confessed by the bishops assembled in council or more generally by the liturgical assembly of believers. "I believe" is also the Church, our mother, responding to God by faith as she teaches us to say both "I believe" and "We believe".
168 It is the Church that believes first, and so bears, nourishes and sustains my faith. Everywhere, it is the Church that first confesses the Lord: "Throughout the world the holy Church acclaims you", as we sing in the hymn Te Deum; with her and in her, we are won over and brought to confess: "I believe", "We believe". It is through the Church that we receive faith and new life in Christ by Baptism. In the Rituale Romanum, the minister of Baptism asks the catechumen: "What do you ask of God's Church?" And the answer is: "Faith." "What does faith offer you?" "Eternal life." 54
169 Salvation comes from God alone; but because we receive the life of faith through the Church, she is our mother: "We believe the Church as the mother of our new birth, and not in the Church as if she were the author of our salvation." 55 Because she is our mother, she is also our teacher in the faith.
170 We do not believe in formulae, but in those realities they express, which faith allows us to touch. "The believer's act [of faith] does not terminate in the propositions, but in the realities [which they express]." 56 All the same, we do approach these realities with the help of formulations of the faith which permit us to express the faith and to hand it on, to celebrate it in community, to assimilate and live on it more and more.
171 The Church, "the pillar and bulwark of the truth", faithfully guards "the faith which was once for all delivered to the saints". She guards the memory of Christ's words; it is she who from generation to generation hands on the apostles' confession of faith. 57 As a mother who teaches her children to speak and so to understand and communicate, the Church our Mother teaches us the language of faith in order to introduce us to the understanding and the life of faith.
172 Through the centuries, in so many languages, cultures, peoples and nations, the Church has constantly confessed this one faith, received from the one Lord, transmitted by one Baptism, and grounded in the conviction that all people have only one God and Father. 58 St. Irenaeus of Lyons, a witness of this faith, declared:
173 "Indeed, the Church, though scattered throughout the whole world, even to the ends of the earth, having received the faith from the apostles and their disciples. . . guards [this preaching and faith] with care, as dwelling in but a single house, and similarly believes as if having but one soul and a single heart, and preaches, teaches and hands on this faith with a unanimous voice, as if possessing only one mouth." 59
174 "For though languages differ throughout the world, the content of the Tradition is one and the same. The Churches established in Germany have no other faith or Tradition, nor do those of the Iberians, nor those of the Celts, nor those of the East, of Egypt, of Libya, nor those established at the centre of the world. . ." 60 The Church's message "is true and solid, in which one and the same way of salvation appears throughout the whole world." 61
175 "We guard with care the faith that we have received from the Church, for without ceasing, under the action of God's Spirit, this deposit of great price, as if in an excellent vessel, is constantly being renewed and causes the very vessel that contains it to be renewed." 62
176 Faith is a personal adherence of the whole man to God who reveals himself. It involves an assent of the intellect and will to the self-revelation God has made through his deeds and words.
177 "To believe" has thus a twofold reference: to the person, and to the truth: to the truth, by trust in the person who bears witness to it.
178 We must believe in no one but God: the Father, the Son and the Holy Spirit.
179 Faith is a supernatural gift from God. In order to believe, man needs the interior helps of the Holy Spirit.
180 "Believing" is a human act, conscious and free, corresponding to the dignity of the human person.
181 "Believing" is an ecclesial act. The Church's faith precedes, engenders, supports and nourishes our faith. The Church is the mother of all believers. "No one can have God as Father who does not have the Church as Mother" (St. Cyprian, De unit. 6: PL 4, 519).
182 We believe all "that which is contained in the word of God, written or handed down, and which the Church proposes for belief as divinely revealed" (Paul VI, CPG # 20).
183 Faith is necessary for salvation. The Lord himself affirms: "He who believes and is baptized will be saved; but he who does not believe will be condemned" (Mk 16:16).
184 "Faith is a foretaste of the knowledge that will make us blessed in the life to come" (St. Thomas Aquinas. Comp. theol. 1, 2).
1 DV 2; cf. Col 1:15; I Tim 1:17; Ex 33:11; Jn 15:14-15; Bar 3:38 (Vulg.).
2 Cf. DV 5.
3 Cf. Rom 1:5; 16:26.
4 Heb 11:8; cf. Gen 12:1-4.
5 Cf. Gen 23:4.
6 Cf. Heb 11:17.
7 Heb 11:1.
8 Rom 4:3; cf. Gen 15:6.
9 Rom 4:11, 18; 4:20; cf. Gen 15:5.
10 Heb 11:2, 39.
11 Heb 11:40; 12:2.
12 Lk 1:37-38; cf. Gen 18:14.
13 Lk 1:45.
14 Cf. Lk 1:48.
15 Cf. Lk 2:35.
16 2 Tim 1:12.
17 Cf. Jer 17:5-6; Ps 40:5; 146:3-4.
18 Mk 1:11; cf. 9:7
19 Jn 14:1.
20 Jn 1:18.
21 Jn 6:46; cf. Mt 11:27.
22 I Cor 12:3.
23 I Cor 2:10-11.
24 Mt 16:17; cf. Gal 1:15; Mt 11:25.
25 DV 5; cf. DS 377; 3010.
26 Dei Filius: 3: DS 3008.
27 St. Thomas Aquinas, STh II-II, 2, 9; cf Dei Filius 3: DS 3010.
28 Dei Filius 3: DS 3008.
29 Dei Filius 3: DS 3009.
30 Dei Filius 3: DS 3008-3010; Cf. Mk 16:20; Heb 2:4.
31 St. Thomas Aquinas, STh II-II 171, 5, obj. 3.
32 John Henry Cardinal Newman, Apologia pro vita sua (London Longman, 1878) 239.
33 St. Anselm, Prosl. prooem. PL 153 225A.
34 Eph 1:18.
35 DV 5.
36 St. Augustine, Sermo 43, 7, 9: PL 38, 257-258.
37 Dei Filius 4: DS 3017.
38 GS 36 § 1.
39 DH 10; cf. CIC, can. 748 § 2.
40 DH 11.
41 DH 11; cf. Jn 18:37; 12:32.
42 Cf. Mk 16:16; Jn 3:36; 6:40 et al.
43 Dei Filius 3: DS 3012; cf. Mt 10:22; 24: 13 and Heb 11:6; Council of Trent: DS 1532.
44 I Tim 1:18-19.
45 Cf. Mk 9:24; Lk 17:5; 22:32
46 Gal 5:6; Rom 15:13; cf. Jas 2:14-26.
47 I Cor 13:12; I Jn 3:2.
48 St. Basil De Spiritu Sancto 15, 36: PG 32, 132; cf. St. Thomas Aquinas, STh II-II, 4, 1.
49 2 Cor 5:7.
50 l Cor 13:12.
51 Rom 4:18.
52 LG 58; John Paul II, RMat 18.
53 Heb 12:1-2.
54 Roman Ritual, Rite of Baptism of Adults.
55 Faustus of Riez, De Spiritu Sancto 1, 2: PL 62, II.
56 St. Thomas Aquinas, STh II-II, 1, 2, ad 2.
57 I Tim 3:15; Jude 3.
58 Cf. Eph 4:4-6.
59 St. Irenaeus, Adv. haeres. I, 10, 1-2: PG 7/1, 549-552.
60 St. Irenaeus, Adv. haeres. I, 10, 1-2: PG 7/1, 552-553.
61 St. Irenaeus, Adv. haeres. 5, 20, I: PG 7/2, 1177.
62 St. Irenaeus, Adv. haeres. 3, 24, I: PG 7/1, 966.
English Translation of the Cathechism of the Catholic Church for the United States of America © 1997, United States Catholic Conference, Inc.