... according to the Westminster Confession of Faith, based on the teaching of Scripture, especially Romans 8:28-30 and Ephesians 1:3-14. “I am sure of this, that he who began a good work in you will bring it to completion at the day of Jesus Christ” (Philippians 1:6). Such comfort, such assurance.
III.6. As God hath appointed the elect unto glory, so hath he, by the eternal and most free purpose of his will, foreordained all the means thereunto. Wherefore, they who are elected, being fallen in Adam, are redeemed by Christ, are effectually called unto faith in Christ by his Spirit working in due season, are justified, adopted, sanctified, and kept by his power, through faith, unto salvation.
VIII.1. It pleased God, in his eternal purpose, to choose and ordain the Lord Jesus, his only begotten Son, to be the Mediator between God and man, the Prophet, Priest, and King, the Head and Savior of his church, the Heir of all things, and Judge of the world: unto whom he did from all eternity give a people, to be his seed, and to be by him in time redeemed, called, justified, sanctified, and glorified.
X.1. All those whom God hath predestinated unto life, and those only, he is pleased, in his appointed and accepted time, effectually to call, by his Word and Spirit, out of that state of sin and death, in which they are by nature, to grace and salvation, by Jesus Christ ....
XI.1. Those whom God effectually calleth, he also freely justifieth: not by infusing righteousness into them, but by pardoning their sins, and by accounting and accepting their persons as righteous; not for anything wrought in them, or done by them, but for Christ's sake alone ....
XII.1. All those that are justified, God vouchsafeth, in and for his only Son Jesus Christ, to make partakers of the grace of adoption ..., are pitied, protected, provided for, and chastened by him, as by a father: yet never cast off, but sealed to the day of redemption; and inherit the promises, as heirs of everlasting salvation.
XIII.1. They, who are once effectually called, and regenerated, having a new heart, and a new spirit created in them, are further sanctified, really and personally, through the virtue of Christ’s death and resurrection, by his Word and Spirit dwelling in them ....
XVII.1. They, whom God hath accepted in his Beloved, effectually called, and sanctified by his Spirit, can neither totally nor finally fall away from the state of grace, but shall certainly persevere therein to the end, and be eternally saved.
XVII.2. This perseverance of the saints depends not upon their own free will, but upon the immutability of the decree of election, flowing from the free and unchangeable love of God the Father; upon the efficacy of the merit and intercession of Jesus Christ, the abiding of the Spirit, and of the seed of God within them, and the nature of the covenant of grace: from all which ariseth also the certainty and infallibility thereof.