HEIDELBERG CATECHISM, Question & Answer 21
“What is true faith?” “It is not only a certain knowledge, whereby I hold for truth all that God has revealed to us in His Word; but also a hearty trust, which the Holy Ghost works in me by the Gospel, that not only to others, but to me also, forgiveness of sins, everlasting righteousness and salvation, are freely given by God, merely of grace, for the sake of Christ’s merits.”
WESTMINSTER CONFESSION OF FAITH, 14.2
“By this faith, a Christian believeth to be true whatsoever is revealed in the Word, for the authority of God himself speaking therein; and acteth differently upon that which each particular passage thereof containeth; yielding obedience to 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.”
WESTMINSTER LARGER CATECHISM, Answer 72
“Justifying faith is a saving grace, wrought in the heart of a sinner by the Spirit and Word of God, whereby he, being convinced of his sin and misery, and of the disability in himself and all other creatures to recover him out of his lost condition, not only assenteth to the truth of the promise of the gospel, but receiveth and resteth upon Christ and his righteousness, therein held forth, for pardon of sin, and for the accepting and accounting of his person righteous in the sight of God for salvation.”
1689 LONDON BAPTIST CONFESSION OF FAITH, 15.3
“Saving repentance is an evangelical grace by which a person who is made to feel, by the Holy Spirit, the manifold evils of his sin, and being given faith in Christ, humbles himself over his sin with godly sorrow, detestation of his sin and self-abhorrency. In such repentance the person also prays for pardon and strength of grace, and has a purpose and endeavours, by supplies of the Spirit’s power, to walk before God and to totally please Him in all things.”