WCF 13.3.
In which war, although the remaining corruption, for a time, may much prevail; (Rom. 7:23) yet, through the continual supply of strength from the sanctifying Spirit of Christ, the regenerate part doth overcome; (Rom. 6:14, 1 John 5:4, Eph. 4:15–16) and so, the saints grow in grace, (2 Pet. 3:18, 2 Cor. 3:18) perfecting holiness in the fear of God. (2 Cor. 7:1)