The Vatican Council
Third Session, Chapter 3
Since human beings are totally dependent on God as their creator and lord, and created reason is completely subject to uncreated truth, we are obliged to yield to God the revealer full submission of intellect and will by faith. This faith, which is the beginning of human salvation, the catholic church professes to be a supernatural virtue, by means of which, with the grace of God inspiring and assisting us, we believe to be true what He has revealed, not because we perceive its intrinsic truth by the natural light of reason, but because of the authority of God himself, who makes the revelation and can neither deceive nor be deceived. Faith, declares the Apostle, is the assurance of things hoped for, the conviction of things not seen . Nevertheless, in order that the submission of our faith should be in accordance with reason, it was God's will that there should be linked to the internal assistance of the Holy Spirit external indications of his revelation, that is to say divine acts, and first and foremost miracles and prophecies, which clearly demonstrating as they do the omnipotence and infinite knowledge of God, are the most certain signs of revelation and are suited to the understanding of all.
Hence Moses and the prophets, and especially Christ our lord himself, worked many absolutely clear miracles and delivered prophecies; while of the apostles we read: And they went forth and preached every, while the Lord worked with them and confirmed the message by the signs that attended it  . Again it is written: We have the prophetic word made more sure; you will do well to pay attention to this as to a lamp shining in a dark place  .
Now, although the assent of faith is by no means a blind movement of the mind, yet no one can accept the gospel preaching in the way that is necessary for achieving salvation without the inspiration and illumination of the Holy Spirit, who gives to all facility in accepting and believing the truth  .
And so faith in itself, even though it may not work through charity, is a gift of God, and its operation is a work belonging to the order of salvation, in that a person yields true obedience to God himself when he accepts and collaborates with his grace which he could have rejected.
Wherefore, by divine and catholic faith all those things are to be believed which are contained in the word of God as found in scripture and tradition, and which are proposed by the church as matters to be believed as divinely revealed, whether by her solemn judgment or in her ordinary and universal magisterium.
Since, then, without faith it is impossible to please God  and reach the fellowship of his sons and daughters, it follows that no one can ever achieve justification without it, neither can anyone attain eternal life unless he or she perseveres in it to the end.
So that we could fulfil our duty of embracing the true faith and of persevering unwaveringly in it, God, through his only begotten Son, founded the church, and he endowed his institution with clear notes to the end that she might be recognised by all as the guardian and teacher of the revealed word. To the catholic church alone belong all those things, so many and so marvellous, which have been divinely ordained to make for the manifest credibility of the christian faith. What is more, the church herself by reason of her astonishing propagation, her outstanding holiness and her inexhaustible fertility in every kind of goodness, by her catholic unity and her unconquerable stability, is a kind of great and perpetual motive of credibility and an incontrovertible evidence of her own divine mission. So it comes about that, like a standard lifted up for the nations  , she both invites to herself those who have not yet believed, and likewise assures her sons and daughters that the faith they profess rests on the firmest of foundations. To this witness is added the effective help of power from on high. For, the kind Lord stirs up those who go astray and helps them by his grace so that they may come to the knowledge of the truth  ; and also confirms by his grace those whom he has translated into his admirable light , so that they may persevere in this light, not abandoning them unless he is first abandoned. Consequently, the situation of those, who by the heavenly gift of faith have embraced the catholic truth, is by no means the same as that of those who, led by human opinions, follow a false religion; for those who have accepted the faith under the guidance of the church can never have any just cause for changing this faith or for calling it into question.
This being so, giving thanks to God the Father who has made us worthy to share with the saints in light  let us not neglect so great a salvation  , but looking unto Jesus the author and finisher of our faith  , let us hold the unshakeable confession of our hope .
17. Heb 11, 1
18. Mk 16, 20.
19. 2 Pt 1, 19.
20. Council of Orange II(529), canon 7 (Bruns 2, 178; Msi 8, 713)
21. Heb 11, 6.
22. Is 11, 12
23. 1 Tm 2, 4
24. 1 Pt 2, 9; Col 1, 13
25. Col 1, 12
26. Heb 2, 3
27. Heb 12, 2
28. Heb 10, 12