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Sanctification and the Battle Against Sin in Christian Life

Sanctification denotes the progressive work of the Holy Spirit by which believers are conformed to the image of Christ, extending to the whole person and continuing throughout earthly life [1]. This process begins at regeneration but unfolds over time as the Spirit brings "the whole nature more and more under the influences of the new gracious principles implanted in the soul" [1]. Scripture describes this state plainly: "But now, being made free from sin, and having become servants of God, you have your fruit of sanctification, and the result of eternal life" [4]. The term itself signifies separation to God's service [2], a setting apart that is both positional (accomplished at conversion) and progressive (worked out in daily obedience).

The Agent and Means of Sanctification

The work is effected by God the Father, Christ, and the Holy Spirit [2]. Christ sanctifies believers through his atoning work [2], while the Spirit carries forward the application of redemption in the believer's experience [1]. The Word of God serves as a principal instrument: Jesus prayed, "Sanctify them through thy truth: thy word is truth" (John 17:17), and Paul writes that Christ sanctifies the church "by the washing of water by the word" (Ephesians 5:26) [2]. This sanctification occurs "in Christ" [2], meaning believers are united to him and draw their transforming power from that union. The process is not a mere moral reformation achieved by human effort but a supernatural operation that nevertheless engages the believer's will and action [1].

The Battle Against Indwelling Sin

Sanctification necessarily involves conflict. All human beings are born sinners, yet "whereas the wicked indulge their sinful nature, the godly fight against it" [9]. Even after regeneration, believers retain a corrupt old nature that adheres to them [11], and they continue to commit actual sins [11]. The apostle Paul's description of this struggle in Romans 7 reflects the ongoing tension between the regenerate will and remaining corruption. John's first epistle addresses this plainly: to claim "we have no sin" is self-deception, and to claim "we have not sinned" makes God a liar [11]. The perfect tense in 1 John 1:10 "brings down the commission of sins to the present time, not merely sins committed before, but since, conversion" [11].

Yet the believer's relationship to sin has fundamentally changed. Those who practice sin habitually are "of the devil" by imitation, not by generation [10]—the devil begets none but corrupts those who follow his pattern [10]. By contrast, believers are called to "fight the good fight of the faith" [3, 5], a military metaphor indicating sustained, active resistance. Sanctification "should lead to mortification of sin" [2], the deliberate putting to death of sinful desires and actions. This mortification is not optional but intrinsic to the sanctified life, as Paul writes: "For this is the will of God, even your sanctification" [13]. External sanctification, which "arises from" the internal work of the Spirit, "lies in holiness of life and conversation" [13].

Distinction from Justification

Sanctification must be distinguished from justification, though the two are inseparable in experience. Justification is God's forensic act by which he pardons sin and declares the believer righteous, satisfying all the law's demands in a single judicial pronouncement [8]. Forgiveness of sin is "one of the constituent parts of justification" [7], removing the guilt and eternal liability for sin [7]. Sanctification, by contrast, is progressive and experiential, addressing not the legal standing but the moral condition of the believer. Where justification is complete at conversion, sanctification advances throughout life, never reaching perfection in this age. The distinction prevents the error of supposing that increased grace licenses continued sin—a notion Paul rejects emphatically: "Shall we continue in sin that grace may abound? God forbid" [12].

The church is made glorious by sanctification [2], and all saints are described as being "in a state of" sanctification [2], having been set apart for God's purposes. This separation is both a present reality and an ongoing process, anchored in Christ's finished work and applied by the Spirit through Scripture and prayer [6].

Sources

  1. Easton's Bible Dictionary “Easton's Bible Dictionary: Sanctification — Involves more than a mere moral reformation of character, brought about by the power of the truth: it is the work of the Holy Spirit bringing the whole nature more and more under the influences of the new gracious principles implanted in the soul in regeneration. In other words, sanctification is the carrying on to perfection the work begun in regeneration, and it extends to the whole man (Rom. 6:13; 2 Cor. 4:6; Col. 3:10; 1 John 4:7; 1 Cor. 6:19). It is the special office of the Holy Spirit in the plan of redemption to carry on this work (1 Cor. 6:1”
  2. Torrey's Topical Textbook “Torrey's Topical Textbook: Sanctification — Is separation to the service of God -- Ps 4:3; 2Co 6:17. Effected by God. -- Eze 37:28; 1Th 5:23; Jude 1:1. Christ. -- Heb 2:11; 13:12. The Holy Spirit. -- Ro 15:16; 1Co 6:11. In Christ -- 1Co 1:2. Through the atonement of Christ -- Heb 10:10; 13:12. Through the word of God -- Joh 17:17,19; Eph 5:26. Christ made, of God, to us -- 1Co 1:30. Saints elected to salvation through -- 2Th 2:13; 1Pe 1:2. All saints are in a state of -- Ac 20:32; 26:18; 1Co 6:11. The Church made glorious by -- Eph 5:26,27. Should lead to Mortification of sin. -- 1Th 4:3,4. Ho”
  3. I Timothy “I Timothy 6:12 (BSB) — Fight the good fight of the faith. Take hold of the eternal life to which you were called when you made the good confession before many witnesses.”
  4. Romans “But now, being made free from sin, and having become servants of God, you have your fruit of sanctification, and the result of eternal life. -- Romans 6:22”
  5. 1 Timothy “Fight the good fight of faith. Lay hold of the eternal life to which you were called, and you confessed the good confession in the sight of many witnesses. -- 1 Timothy 6:12”
  6. 1 Timothy “For it is sanctified through the word of God and prayer. -- 1 Timothy 4:5”
  7. Easton's Bible Dictionary “Easton's Bible Dictionary: Forgiveness of sin — One of the constituent parts of justification. In pardoning sin, God absolves the sinner from the condemnation of the law, and that on account of the work of Christ, i.e., he removes the guilt of sin, or the sinner's actual liability to eternal wrath on account of it. All sins are forgiven freely (Acts 5:31; 13:38; 1 John 1:6-9). The sinner is by this act of grace for ever freed from the guilt and penalty of his sins. This is the peculiar prerogative of God (Ps. 130:4; Mark 2:5). It is offered to all in the gospel. (See [219]JUSTIFICATION.)”
  8. Easton's Bible Dictionary “Easton's Bible Dictionary: Justification — A forensic term, opposed to condemnation. As regards its nature, it is the judicial act of God, by which he pardons all the sins of those who believe in Christ, and accounts, accepts, and treats them as righteous in the eye of the law, i.e., as conformed to all its demands. In addition to the pardon (q.v.) of sin, justification declares that all the claims of the law are satisfied in respect of the justified. It is the act of a judge and not of a sovereign. The law is not relaxed or set aside, but is declared to be fulfilled in the strictest sense; an”
  9. Psalms (Protestant academic) “Tyndale House on Psalms 58:3: 58:3 All human beings are born sinners (see 51:5); however, whereas the wicked indulge their sinful nature, the godly fight against it (Rom 7:19-23; Jas 4:1-10).”
  10. 1 John (Presbyterian) “Jamieson, Fausset & Brown on 1 John 3:8: He that committeth sin is of the devil--in contrast to "He that doeth righteousness," Jo1 3:7. He is a son of the devil (Jo1 3:10; Joh 8:44). John does not, however, say, "born of the devil." as he does "born of God," for "the devil begets none, nor does he create any; but whoever imitates the devil becomes a child of the devil by imitating him, not by proper birth" [AUGUSTINE, Ten Homilies on the First Epistle of John, Homily 4.10]. From the devil there is not generation, but corruption [BENGEL]. sinneth from the beginning--from the time that any beg”
  11. 1 John (Presbyterian) “Jamieson, Fausset & Brown on 1 John 1:10: Parallel to Jo1 1:8. we have not sinned--referring to the commission of actual sins, even after regeneration and conversion; whereas in Jo1 1:8, "we have no sin," refers to the present GUILT remaining (until cleansed) from the actual sins committed, and to the SIN of our corrupt old nature still adhering to us. The perfect "have . . . sinned" brings down the commission of sins to the present time, not merely sins committed before, but since, conversion. we make him a liar--a gradation; Jo1 1:6, "we lie"; Jo1 1:8, "we deceive ourselves"; worst of al”
  12. Romans (Nonconformist/Puritan) “Matthew Henry on Romans 6:1: The apostle's transition, which joins this discourse with the former, is observable: "What shall we say then? Rom 6:1. What use shall we make of this sweet and comfortable doctrine? Shall we do evil that good may come, as some say we do? Rom 3:8. Shall we continue in sin that grace may abound? Shall we hence take encouragement to sin with so much the more boldness, because the more sin we commit the more will the grace of God be magnified in our pardon? Is this a use to be made of it?" No, it is an abuse, and the apostle startles at the thought of it (Rom 6:2): "Go”
  13. 1 Thessalonians (Baptist/Reformed) “John Gill on 1 Thessalonians 4:3: For this is the will of God, even your sanctification,.... Which is another reason to enforce the above exhortation. "Sanctification" is internal or external. Internal sanctification is the work of the Spirit of God, and is a principle of spiritual life in the soul, a divine and spiritual light in the understanding, a flexion of the will to the will of God, and a settlement of the affections on divine things, and is an implantation of every grace in the heart. External sanctification arises from this, and lies in holiness of life and conversation; and is what ”
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