Westminster Confession of Faith

The grace of faith, whereby the elect are enabled to believe to the saving of their souls,²⁷⁹ is the work of the Spirit of Christ in their hearts;²⁸⁰ and is ordinarily wrought by the ministry of the Word:²⁸¹ by which also, and by the administration of the sacraments, and prayer, it is increased and strengthened.²⁸²

By this faith, a Christian believeth to be true whatsoever is revealed in the Word, for the authority of God Himself speaking therein;²⁸³ and acteth differently upon that which each particular passage thereof containeth; yielding obedience to the commands,²⁸⁴ trembling at the threatenings,²⁸⁵ and embracing the promises of God for this life, and that which is to come.²⁸⁶ 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.²⁸⁷

This faith is different in degrees, weak or strong;²⁸⁸ may be often and many ways assailed, and weakened, but gets the victory;²⁸⁹ growing up in many to the attainment of a full assurance through Christ,²⁹⁰ who is both the author and finisher of our faith.²⁹¹