Westminster Confession Of Faith – Lord’s Day 21
Chapter 13 – Of Sanctification
I. They who are 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; the dominion of the whole body of sin is destroyed, and the several lusts thereof are more and more weakened and mortified, and they more and more quickened and strengthened, in all saving graces, to the practice of true holiness, without which no man shall see the Lord.
II. This sanctification is throughout in the whole man, yet imperfect in this life: there abides still some remnants of corruption in every part, whence arises a continual and irreconcilable war, the flesh lusting against the Spirit, and the Spirit against the flesh.
III. In which war, although the remaining corruption for a time may much prevail, yet, through the continual supply of strength from the sanctifying Spirit of Christ, the regenerate part does overcome: and so the saints grow in grace, perfecting holiness in the fear of God.