Part 1: The Necessity of Mortification
Chapters 1 & 2 are both really good, chapter 2 especially.
Rom 8:13 is his foundational text: “For if you live according to the flesh you will die, but if by the Spirit you put to death [mortify] the deeds of the body, you will live.”
The “if” in “if...you put to death” is not a cause effect relationship, as salvation is a gift, but a means and end relationship. “There is a certain infallible connection and coherence between true mortification and eternal life.”
The body, the flesh, the old man are also synonymous terms for indwelling sin, the corrupted flesh. “We know that our old man was crucified with him in order that the body of sin might be brought to nothing, so that we would no longer be enslaved to sin.” (Romans 6:6)
“Put to death” is metaphorical. To kill something is to take away the principle of all its strength, vigor, and power.
“Put to death therefore what is earthly in you: sexual immorality, impurity, passion, evil desire, and covetousness, which is idolatry.” (Colossians 3:5, ESV)
Sin is always there attempting to corrupt, so it is your perpetual duty to mortify it. Believers have had the condemning power of sin defeated, but they must still battle its indwelling.
“For we know that the law is spiritual, but I am of the flesh, sold under sin. For I do not understand my own actions. For I do not do what I want, but I do the very thing I hate. Now if I do what I do not want, I agree with the law, that it is good. So now it is no longer I who do it, but sin that dwells within me. For I know that nothing good dwells in me, that is, in my flesh. For I have the desire to do what is right, but not the ability to carry it out. For I do not do the good I want, but the evil I do not want is what I keep on doing.” (Romans 7:14-19, ESV)
“For I delight in the law of God, in my inner being, but I see in my members another law waging war against the law of my mind and making me captive to the law of sin that dwells in my members.” (Romans 7:22-23, ESV)
“For the desires of the flesh are against the Spirit, and the desires of the Spirit are against the flesh, for these are opposed to each other, to keep you from doing the things you want to do.” (Galatians 5:17, ESV)
“Take care, brothers, lest there be in any of you an evil, unbelieving heart, leading you to fall away from the living God. But exhort one another every day, as long as it is called "today," that none of you may be hardened by the deceitfulness of sin. For we have come to share in Christ, if indeed we hold our original confidence firm to the end.” (Hebrews 3:12-14, ESV)
Indwelling sin, if not carefully guarded against and put to death, will cause shipwreck of one’s faith. When sin is allowed to achieve victories over the Spirit, it destroys the believer’s joy in his salvation and any usefulness he had for the kingdom. See for example Psalm 51, where David talks about his sin with Bathsheba.
Though we are commanded to put to death the sin in our lives, the true efficient cause of any sanctification is the Holy Spirit. Means such as prayer, fasting, watching, & meditation are "streams" not "the fountain." Without Christ we ca do nothing.
The Holy Spirit mortifies sin by causing our hearts to abound in grace and fruits contrary to the flesh. It is the renewing of the Spirit. It is the Holy Spirit's work in the same way that all grace and good works in our lives are His. Fighting against sin without the Spirit is sad as they are trying to achieve goodness through the Law and that is hopeless.
Every unmortified sin weakens and darkens the soul. It destroys our communion with God and the "joy of our salvation." Psalm 51. It makes us weak and unable to be any spiritual use. Every sin desires to grow, every thought of hate would be murder, lust would be fornication, and if left unmortified it will grow until it consumes your thoughts and destroys your life.
Part 2: The Nature of Mortification
His outline is:
1. Show what it is to mortify a sin, both negatively and positively.
2. Give general directions for mortification.
3. Draw out particulars whereby mortification is to be done.
Mortification is not the utter destruction and death of sin. That is what is aimed at, but we cannot expect complete success in this life. Paul says not even he was perfect (Phil 3:12).
Mortification is not merely the ceasing of outward actions of a sin. Beating down the fruit of a tree is not effectual if the roots are left untouched, more fruit will grow again shortly. "This is the folly of some men; they set themselves with all earnestness and diligence against the appearing eruption of lust, but, leaving the principle and root untouched, perhaps unsearched out, they make but little or no progress in this work of sanctification."
Mortification is not the diversion of sin. Simon in Acts 8 left his sorceries for a season, but his covetousness and ambition, which were the root sins, were never mortified. His internal lusts were just as strong as they had ever been. If someone sets himself against the outbreak of some lust, and is able to prevent it from pouring forth in that way again, but does not put to death the internal lust itself, it will find another outlet in his life. Men in old age usually do not pursue the same lusts of their youth, but most have not mortified, or put to death, those lusts.
Mortification is not an occasional "victory" over sin, caused by disgust with a particularly repugnant outbreak of sin. Sin may lie quiet for a time, even seeming mortified, but it will return after the hurry and inquest is over.
Mortification is the habitual weakening of sin. So that is does not impel and agitate as it did prior. Its strength and power is taken away. A sin that has been mortified moves but sparingly, and then only faintly, like a man on a cross who, nearing the end, is running out of strength. Romans 6:6, "We know that our old self was crucified with him in order that the body of sin might be brought to nothing, so that we would no longer be enslaved to sin." (ESV)
Lusts are strengthened by temptation.
Because of a man's natural temperament, some lusts may be stronger in him than others, but this does not in any ways mitigate his guilt. And some lusts are more outwardly noticeable, but hidden internal lusts are just as destructive to a man's soul.
Mortification consists in constant fighting and contending against sin. This firstly requires knowing the danger of the enemy one carries within. Warfare requires work to learn the ways, wiles, methods, and occasions of success of the enemy. We are to work to inflict new blows against sin daily, not being content when it is quiet, but ever attempting to wound it more.
Mortification consists in frequent success against sin. One finds sin at work seducing, and instantly brings it to the law of God and love of Christ and condemns it. When a man has weakened his lusts in their root and principle, that their motions and actions are few and weak that they do not hinder his duty nor interrupt his peace, when he regularly finds out and fights against sin with success, that man may have peace with God all his days.
We weaken sin's root by implanting its opposite. Pride is weakened by growing humility, worldliness by heavenly-mindedness, etc.
Colossians 3:5–10, "Put to death therefore what is earthly in you: sexual immorality, impurity, passion, evil desire, and covetousness, which is idolatry. On account of these the wrath of God is coming. In these you too once walked, when you were living in them. But now you must put them all away: anger, wrath, malice, slander, and obscene talk from your mouth. Do not lie to one another, seeing that you have put off the old self with its practices and have put on the new self, which is being renewed in knowledge after the image of its creator." (ESV)
A man must be a believer to mortify sin. There can be mortification of sin in an unregenerate soul. This is the fault of works-based religion. Mortification is the work of the Spirit, so someone without the Spirit is unable to make any progress. Romans 9:31b–32 "Israel who pursued a law that would lead to righteousness did not succeed in reaching that law. Why? Because they did not pursue it by faith, but as if it were based on works." (ESV) Men must undertake the conversion of their whole soul before they can be concerned with the mortification of a particular lust. "Be sure to get an interest in Christ - if you intend to mortify any sin without it, it will never be done." The axe must be laid to the root. Convincing unregenerate men to refrain from some earthly lust may have some beneficial effect on society, but it does nothing towards saving their souls, and in fact, can give them false comfort.
Ch 8:
There will be no mortification of any sin without sincerity and diligence in a universality of obedience. Someone may have one sin besetting them that greatly troubles them such that they pray and groan against it, giving them no peace, but if they are lax in their other duties, they should not expect to be delivered. Hatred of sin as sin, not only as galling or disquieting, and a sense of the love of Christ in the cross are where real mortification comes from. If someone strives to break free from one "serious" sin but meanwhile delights in filthy speech and neglects prayer and Scripture, they shall fail. Christ bled for those sins just as much. This is fighting against sin only because of your own trouble by it, not its inherent filthiness and the guilt of it. If it did not bother you, you wouldn't trouble about it. An unbelieving alcoholic may fight against the addiction to alcohol, but that doesn't arise from any desire for holiness. God will not ease you of that which afflicts you so that you can continue to do that which no less grieves Him. 'God says, "Here is one, if he could be rid of this lust I should never hear of him more; let him wrestle with this, or he is lost."' We need a universal frame of humbleness that abhors every evil.
Particular Directions for the one engaged in mortifying sin: Ch 9-13
Sin that has lain unmortified for a long time is especially serious. It has become familiar to the mind and conscience, and is basically indistinguishable from one still being under the dominion of sin as an unbeliever. A "regular course" of mortification will not suffice for such a sin.
When, upon confrontation with sin, instead of applying oneself to its destruction, one instead searches for solace in grace and mercy, one is in a dangerous condition. It reveals a heart that loves sin and undervalues peace and communion with God. A heart that, so long as it can escape hell, is content to be of no spiritual service to God whatsoever. Grace and mercy should never be applied to a sin that one is not engaged in attempting to put to death.
"Are we to continue in sin that grace may abound? By no means! How can we who died to sin still live in it? (Rom 6:1b-2 ESV).
"Do you suppose, O man—you who judge those who practice such things and yet do them yourself—that you will escape the judgment of God? Or do you presume on the riches of his kindness and forbearance and patience, not knowing that God’s kindness is meant to lead you to repentance?" (Romans 2:3–4 ESV)
When a man must use arguments with himself against sin revolving around its punishment, his heart does not hate sin as it should. A believer should have the detestable nature of sin, the preciousness of communion with God, and the love of Christ displayed on the cross causing a deep-seated abhorrence for sin as sin. As the attitude of Joseph with Potiphar's wife, "How then can I do this great wickedness and sin against God?” (Gen 39:9 ESV). Sin has possessed the will and affections to a great degree of a man who can only fight against sin using the law, devoid of Gospel weapons. Paul's call to believers to avoid sin was always one of "you are no longer under law, but grace."
The first step of one who would mortify sin is to get a clear grasp of the guilt of his sin.
Consider its danger, first its hardening power, and second the possibility of a chastening by God. Sin tends to harden, every sin makes some progress towards that eventuality. Eventually one will be "sermon-proof," you sin can be spoken and thought of without nary a thought or concern. You can avoid all spiritual duties without being the least bit affected. "Sin will grow a light thing in you." Symptoms of this are slight thoughts of heaven, hell, Christ's blood, grace, mercy, justice, etc. Thirdly, it will destroy all peace you have with God. Consider David's words in the Psalms of how his bones were broken and he didn't have the strength to look up, while plunged in his sin (Psalms 38 & 42). Fourthly, there is the danger of eternal destruction, as one who continues forever in unmortified sin should have no expectation of being saved.
Hebrews 3:12–13, "Take care, brothers, lest there be in any of you an evil, unbelieving heart, leading you to fall away from the living God. But exhort one another every day, as long as it is called “today,” that none of you may be hardened by the deceitfulness of sin." (ESV)
Consider the evils of it. It grieves the Holy Spirit. Ephesians 4:30, "And do not grieve the Holy Spirit of God, by whom you were sealed for the day of redemption." (ESV). It destroys a man's usefulness.
Additionally, one should load their conscience with the guilt of their sin. Be aware of terrors of God and His Law, His holiness. The proper work of the Law is to find out sin. David said his iniquity was ever before him. Psalm 51:3, "For I know my transgressions, and my sin is ever before me." (ESV). Think about the evil of what you have done, how you have spit in the face of the God who died for you, defiled the abode of the Holy Spirit, despised the grace of God and communion with God, valued all these things as less than that of the sin pursued. Only then should you consider God's infinite patience and forbearance
One should constantly long for deliverance from sin's power. That was one of the results Paul rejoiced in from his letter to the Corinthians (2 Cor 7:11). Paul clearly longed for deliverance from sin's power (Rom 7:24). "Assure yourself, unless you long for deliverance, you shall not have it."
Sin which is particularly powerful in a believer's life, that is rooted in his nature and increased by his particular constitution, seems to be sin that the disciplining of the body to bring it into subjection is useful for (1 Cor 9:27). Fasting, watching, meditating, etc., are means given by God to put to death sin, but they cannot bring about true mortification of sin by virtue of their own power, in and of themselves, otherwise any unregenerate person could mortify sin, completely absent the help of the Spirit.
We are to watch or guard against sin. Luke 21:34, “But watch yourselves lest your hearts be weighed down with dissipation and drunkenness and cares of this life, and that day come upon you suddenly like a trap." (ESV). We should see what occasions, companies, and conditions sin has used to attack us and avoid them.
We are to rise against the first conceptions of sin arising in us as against their ultimate completion. One cannot fix bounds to sin, saying it can come this far, but no further. It must be stopped where it arises, or else it will take over the whole person. Every thought of envy would have you murder and steal.
Consider that which should fill you with thoughts of self-abasement. The response of Job upon seeing the greatness of God, “I had heard of you by the hearing of the ear, but now my eye sees you; therefore I despise myself, and repent in dust and ashes." (Job 42:5, ESV), should be how we respond to God. Another similar passage is Proverbs 30:2-4. We no so little of the awesome majesty of God. “No man can see God and live.” and the response of any who has an encounter with Him is always self-loathing at their own wickedness. That is how we would respond if confronted with the holiness of God.
The difference between believers and unbelievers as to knowledge is not so much in the matter or amount of their knowledge as in the manner of their knowing. “The Excellency of a believer is, not that he has a large apprehension of things, but that what he does apprehend, which perhaps may be very little, he sees in the light of the Spirit of God, in a saving, soul-transforming light; and this is that which gives us communion with God, and not prying thoughts or curious-raised notions.
Speak not peace to yourself before God does. If one feels the stir of conviction from the Spirit, and then seek after a peace-giving word not accompanied by an abhorrence of the sin which caused the disquietment, that peace is not from God, but is the man’s own creation. Look at how godly men in Scripture responded when confronted with their sin, they were not quick to minimize its significance and go immediately to a peace-giving word of grace. They were filled with self-abhorrence and shame at what they had done.
Part 3: The Means of Mortification
The Spirit alone convinces the heart of the evil and guilt and danger of the corruption, lust, or send to be mortified. Without that, all that follows is in vain. Men may convince the mind that something is sinful, but the mind cannot overrule the heart for long.