“‘But how does the Spirit give us victory?’ By our living in the Spirit and walking after the Spirit. As we abound in the graces of the Spirit and walk according to them, the fruits of the Spirit restrict the fruits of the flesh, because the works of the flesh are contrary to the works of the Spirit. This renewing of us by the Holy Spirit, as it is called (Titus 3:5), is one great way of mortification. He causes us to grow, thrive, flourish, and abound in the graces which are contrary, opposite, and destructive to all the works of the flesh, and contrary to the thriving of indwelling sin itself.
By the effective destruction of the root and habit of sin, to weaken, destroy, and take it away. He is called a ‘Spirit of judgment and of burning’ (Isa. 4:4), in really consuming and destroying our lusts. He takes away the stony heart by an almighty work. He begins this work, as to its kind, and then carries it on by degrees. He is the fire that burns up the very root of lust.
He brings the cross of Christ into the heart of a sinner by faith, and gives communion with Christ in His death, and fellowship in His sufferings.”
– John Owen, The Mortification of Sin, p.18