How does the Spirit mortify sin?
i. By causing our hearts to abound in grace and the fruits that are contrary to the works of the flesh.
ii. By the effective destruction of the root and habit of sin, to weaken, destroy, and take it away.
iii. 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.*
*From The Mortification of Sin: Abridged and made easy to read by Richard Rushing, Banner of Truth, pgs. 17 & 18.