Hugh Martin draws our attention back to the cross of Christ for the power to live the christian life and kill sin.
Finally, let me speak briefly of the cure of heart plagues. The discovery of heart plagues may be effected by examining the life and character of Christ. The cure of them will be found in his death. It is the death of Christ alone that has virtue in it to heal our plagues, to mortify and slay our lusts. All your resolutions, all your wise plans of surmounting and expelling your plagues, will never succeed unless you bring them continually to the cross of Christ. You must have believing communion with a crucified Saviour if you are to mortify the deeds of the body, to crucify the flesh with its affections and lusts. Without this you may change one for another, but you will never aright mortify or vanquish any. Christ gave himself for us that he might redeem us from all iniquity. There is secret virtue in his blood, received by faith alone, which powerfully wastes the energy of every plague and sinful habit. Our old man is crucified with him, that the body of sin might be destroyed, that henceforth we should not serve sin. Engrafted into his death we become dead to sin, and sin reigns not in our mortal bodies, that we should obey it in the lusts thereof. Whatever heart plague you have discovered, bring it to the cross of Christ.