Westminster Confession of Faith
Chapter 14
Saving Faith
1. The grace of faith, by which the elect are enabled to believe to the saving of their souls, is the work of the Spirit of Christ in their hearts, and is ordinarily produced through the ministry of the Word. This faith is increased and strengthened by the same means, and also by the administration of the sacraments and prayer.
2. By this faith, a Christian believes to be true whatever is revealed in the Word, because of the authority of God himself speaking in it. He also responds differently to what each particular passage contains—obeying the commands, trembling at the threatenings, and embracing the promises of God for this life and that which is to come. But the principal acts of saving faith are accepting, receiving, and resting upon Christ alone for justification, sanctification, and eternal life, by virtue of the covenant of grace.
3. This faith varies in degrees. It may be weak or strong. It may often, and in many ways, be assailed and weakened, but it gains the victory. It matures in many to the attainment of a full assurance through Christ, who is both the author and the perfecter of our faith.