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Faith as Instrument of Sanctification in Christian Theology

Sanctification, in Christian thought, refers to the process by which believers are made holy and conformed to the image of Christ. It is a work of the Holy Spirit that brings the entire person increasingly under the influence of the new principles implanted during regeneration [1]. This process involves separation to the service of God [2] and extends to the whole individual, encompassing moral reformation and spiritual growth [1]. While God, Christ, and the Holy Spirit are identified as the agents of sanctification [2], faith serves as a crucial instrument in this ongoing work.

The concept of sanctification is distinct from justification, though both are integral to salvation. Justification is a forensic act of God, a judicial declaration where God pardons sins and accounts believers as righteous in His sight, satisfying the demands of the law through Christ [5]. Sanctification, by contrast, is an ongoing process of spiritual transformation and growth in holiness [1]. It is the "carrying on to perfection the work begun in regeneration" [1].

Faith, defined as the persuasion of the mind that a statement is true, inherently involves trust and is a result of teaching [6]. It is not merely an intellectual assent but includes an act of the will [6]. In the context of sanctification, faith is understood as an active principle that enables believers to participate in and experience this transformative work. The apostle Paul, in 1 Thessalonians 1:3, speaks of the "work of faith," which Jamieson, Fausset & Brown interpret as the "working reality" of faith, demonstrating its alacrity in receiving truth and manifesting itself through its fruits. This "work of faith" is not a passive assent but a "realizing, working faith" [10].

Scripture highlights several ways faith acts as an instrument in sanctification:

First, faith connects believers to Christ, who is Himself the source of sanctification. 1 Corinthians 1:30 states that Christ "became to us wisdom from God, righteousness and sanctification and redemption." Torrey's Topical Textbook notes that sanctification is "in Christ" and "through the atonement of Christ" [2]. By faith, believers are united with Christ, drawing from His holiness for their own transformation. This union is foundational, as faith is the means by which believers appropriate the benefits of Christ's work, including sanctification.

Second, faith is instrumental in the application of God's Word, which is a primary means of sanctification. Jesus prayed, "Sanctify them in the truth; your word is truth" (John 17:17). The Geneva Bible and the King James Version of 1 Timothy 4:5 state that something is "sanctified by the worde of God, and prayer" [3, 4]. Faith is essential for receiving and obeying this Word. As believers trust and act upon God's commands and promises revealed in Scripture, they are progressively sanctified. John Chrysostom, in his homilies, frequently references various biblical passages, including those from Genesis and Exodus, which underscore the importance of divine instruction and covenant relationship, implicitly requiring faith for adherence and transformation [9, 11, 13, 16].

Third, faith is crucial for the work of the Holy Spirit in sanctification. The Holy Spirit is the primary agent of sanctification, bringing the entire nature of the believer under the influence of new gracious principles [1]. Romans 15:16 speaks of believers being "sanctified by the Holy Spirit," and 1 Corinthians 6:11 mentions being "sanctified... by the Spirit of our God" [2]. Faith allows believers to yield to the Spirit's leading, enabling Him to produce the fruits of righteousness and holiness in their lives. This cooperation between the believer's faith and the Spirit's work is vital for growth in sanctification.

Fourth, faith is linked to prayer, another means of sanctification. As seen in 1 Timothy 4:5, "it is sanctified through the word of God and prayer" [3]. Prayer, offered in faith, is a means by which believers seek God's grace and strength for sanctification. Through prayer, they confess sins, ask for guidance, and express their dependence on God for growth in holiness. This act of faith in prayer aligns the believer's will with God's will for their sanctification.

Fifth, faith is active in the mortification of sin and the pursuit of holiness. Sanctification "should lead to Mortification of sin" [2]. This involves actively putting to death sinful desires and living in obedience to God. Faith provides the conviction and motivation to engage in this spiritual battle. For instance, Jamieson, Fausset & Brown, commenting on Isaiah 32:17, connect "work" (of righteousness) with "peace," implying that righteous actions, stemming from faith, lead to internal and external peace [14]. This active engagement, driven by faith, is a continuous process throughout the believer's life.

The Eastern Orthodox tradition, as reflected in the writings of John Chrysostom, emphasizes the transformative power of God's grace and the role of human cooperation. While not explicitly using the term "instrument of sanctification" in the same systematic way as some Western traditions, Chrysostom's extensive commentaries on various biblical books, including Genesis, Exodus, Acts, Romans, Galatians, Colossians, and Thessalonians, highlight the importance of faith, obedience, and spiritual discipline in the Christian life [9, 11, 13, 16]. He frequently discusses the moral and spiritual transformation expected of believers, which aligns with the concept of sanctification. For example, his homilies often call for believers to live lives worthy of their calling, to resist sin, and to grow in virtue, all of which presuppose an active faith response to God's grace.

In the Reformed tradition, figures like John Calvin extensively commented on the biblical texts that inform the doctrine of sanctification. While the provided excerpts from Calvin's commentaries primarily offer scriptural references rather than direct theological exposition on faith as an instrument of sanctification [7, 8, 12, 15, 17, 18], the broader Reformed understanding emphasizes that faith, which justifies, is never alone but always accompanied by good works, which are the fruit of sanctification. This "work of faith" is seen as a continuous process where faith actively receives and applies Christ's righteousness, leading to a life of increasing holiness. The Westminster Confession of Faith, a key Reformed document, states that "sanctification is wrought in them [believers] by the Spirit of God dwelling in them, the dominion of the whole body of sin is destroyed, and the several lusts thereof are more and more weakened and mortified, and they more and more quickened and strengthened in all saving graces, to the practice of true holiness, without which no man shall see the Lord." This process is intimately connected to faith, as believers, by faith, draw upon Christ's power for this ongoing transformation.

The Presbyterian tradition, as exemplified by Jamieson, Fausset & Brown, also underscores the active nature of faith in sanctification. Their commentary on 1 Thessalonians 1:3, describing "work of faith" as a "working reality" and "not an otiose assent," directly links faith to its practical outworking in the believer's life [10]. Similarly, their commentary on 1 Peter 3:15, which speaks of "sanctifying Christ as Lord" in one's heart, implies an active, faith-filled devotion that leads to holiness [19]. This perspective emphasizes that genuine faith is not static but dynamic, constantly working itself out in obedience and growth in holiness.

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. 1 Timothy “For it is sanctified through the word of God and prayer. -- 1 Timothy 4:5”
  4. I Timothy “I Timothy 4:5 (Geneva1599) — For it is sanctified by the worde of God, and prayer.”
  5. 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”
  6. Easton's Bible Dictionary “Easton's Bible Dictionary: Faith — Faith is in general the persuasion of the mind that a certain statement is true (Phil. 1:27; 2 Thess. 2:13). Its primary idea is trust. A thing is true, and therefore worthy of trust. It admits of many degrees up to full assurance of faith, in accordance with the evidence on which it rests. Faith is the result of teaching (Rom. 10:14-17). Knowledge is an essential element in all faith, and is sometimes spoken of as an equivalent to faith (John 10:38; 1 John 2:3). Yet the two are distinguished in this respect, that faith includes in it assent, which is an act ”
  7. CCEL (Reformed) “Calvin, Commentary on Isaiah, Vol. 2, section 53.2: 64:7 66:24 Jeremiah 4:31 5:8 5:28 7:4 7:4 9:1 10:23 10:24 10:24 11:21 17:1 17:5 18:16 19:6 19:8 22:24 22:28 25:9 25:13 25:18 28:10 28:11 30:11 31:15 43:2 48:2 50:11 Lamentations 1:7 2:5 2:8 3:29 Ezekiel 15:3 16:26 20:11 20:24 20:25 26:2 26:14 37:1 43:15 43:15 47:11 Daniel 5:28 5:30 5:31 7:10 7:17 8:20 Hosea 1:7 6:4 8:14 9:6 13:3 Joel 1:13 2:13 2:23 2:28 Amos 1:3 3:6 4:1 4:1 5:10 5:19 8:11 Micah 1:3 1:11 2:11 7:9 7:16 Nahum 3:8 Habakkuk 2:1 2:1 2:1 2:2 3:2 3:2 3:13 Zechariah 9:14 13:4 14:3 Malachi 1:4 1:11 4:2 Matthew 2:14 3:12 3:12 3:12 3:12 ”
  8. CCEL (Reformed) “Calvin, Commentary on Genesis, Vol. 1 (Gen 1-23), section 28.1: Index of Scripture References Genesis 1:1-6 1:1-31 1:2 1:28 1:29-30 2:1 2:1-25 2:15 2:19 3:1 3:1-24 3:7 3:16 4:1 4:1-26 4:7 5:1 5:1-32 6:1 6:1-22 6:11-16 7:1-24 7:11 8:1-22 9:1 9:1 9:1-29 9:2 9:24 10 10:1 10:1 10:1-32 10:21 11:1 11:1 11:1-32 11:28 12:1 12:1 12:1 12:1-20 12:4 12:4 12:6 13:1 13:1-20 14:1-24 15:1-21 15:7 16:1-16 16:2 16:8 17:1 17:1 17:1 17:1 17:1-27 18:1 18:1 18:1-33 18:19 19:1-38 20:1 20:1 20:1-18 21:1-34 21:15 22:1-24 22:18 23:1-20 24:31 25:1 25:13-16 35:7 48:1 Exodus 6:3 12:40 Leviticus 7:18 17:4 18:25 Numbers 6:2”
  9. CCEL/NPNF (Eastern Orthodox) “John Chrysostom, Homilies on Acts & Romans: Index of Scripture References Genesis 1:26 2:10 2:18 2:21 2:21 2:24 2:24 2:24 3:5 3:6 3:11 3:16 3:16 3:16 3:19 3:19 4 4:2 4:6 4:7 4:7 4:7 4:9 4:9 4:10 4:10 4:10 4:11 4:14 6:3 6:3 6:9 9:5 9:20 9:22 11:8 11:31 12:3 12:7 12:7 14:14 15:12 15:13-14 18:3 18:3 18:3 18:7 18:17 18:19 18:27 18:33 21:12 22:3 22:18 25:33 27:27 27:41 27:45 28:12 28:20 29:23 30:1-2 31:7 31:15 31:40 32:10 32:21 32:28 32:29 33:19 37:18 39:1-20 40:23 41:40 41:42-43 42:21 45:5 45:5 45:9 45:24 48:16 49:7 60:8 Exodus 1:14 1:22 2:11 2:13 2:15 2:22 3:1 3:2 3:2 4:10 4:22 5:2 9:11 17:4 18:2”
  10. 1 Thessalonians (Presbyterian) “Jamieson, Fausset & Brown on 1 Thessalonians 1:3: work of faith--the working reality of your faith; its alacrity in receiving the truth, and in evincing itself by its fruits. Not an otiose assent; but a realizing, working faith; not "in word only," but in one continuous chain of "work" (singular, not plural, works), Th1 1:5-10; Jam 2:22. So "the work of faith" in Th2 1:11 implies its perfect development (compare Jam 1:4). The other governing substantives similarly mark respectively the characteristic manifestation of the grace which follows each in the genitive. Faith, love, and hope, are the ”
  11. CCEL/NPNF (Eastern Orthodox) “John Chrysostom, Homilies on John & Hebrews: Index of Scripture References Genesis 1:1 1:2 1:3 1:20 1:26 1:26 2:7 2:17 2:18 3:5 3:9 3:9 3:10 3:16 3:18 3:19 4:4 4:7 4:7 4:9 4:10 6:2 6:5 6:9 7:1 11:4 12:1 12:7 12:7 13:15 13:15 15:5 15:6 17:14 18 18 18:15 18:17 18:21 18:21 21:12 22:1 22:1-2 22:12 23:4 25:27 26:18-22 27:41 28:20 37:7 37:9 37:10 47:9 47:9 47:31 49:9 Exodus 2:14 2:14 2:14-15 3:6 3:14 6:9 12:3 12:46 14:21 17:12 17:12 19 19:16 19:16 19:18 19:19 19:19 19:19 19:20 19:20 20:9 20:13 20:19 20:21 23:3 32:10 33:13 33:20 35:23 Leviticus 15:18 Numbers 5 6:3 9:12 11:12 14:3 14:29 16:5 17:12 Deu”
  12. CCEL (Reformed) “Calvin, Commentary on Isaiah, Vol. 1, section 23.2: 62:10 65:20 65:24 Jeremiah 1:6 1:17 2:21 2:21 7:4 7:4 7:21 7:22 9:23-24 9:26 10:14 17:5 17:5 22:7 23:5 23:19 23:36 25:11-12 29:10 30:9 30:9 31:34 32:18 33:15 41:5 48:7 48:13 48:29 48:30 48:32 48:32 48:32 48:34 Lamentations 2:22 3:22 Ezekiel 4:16 13:9 18:20 20:22 34:23 34:23 36:25 37:11-12 37:16 37:24 37:24 47:1 47:1 Daniel 2:44 7:10 7:14 7:27 9:24 9:27 Hosea 2:5 2:13 2:18 2:19-20 2:23 3:4 3:5 6:6 13:11 14:2 14:9 Joel 2:31 2:32 2:32 Amos 2:4-5 3:11 5:11 5:18 5:20 5:21 6:11 9:11 9:11 Jonah 1:2 3:10 Micah 1:16 5:10 6:7-8 7:8 Habakkuk 1:16 2:2 2:”
  13. CCEL/NPNF (Eastern Orthodox) “John Chrysostom, Homilies on Acts & Romans: 1:19 1:20 1:20 2:1-2 2:2 2:8 2:8 2:9 2:9 2:12 2:14 2:14 2:15 3:2-9 3:5 3:8-12 3:16 4:13 4:13 4:19 5:5 5:6 5:16 5:20 5:23 5:23 6:2 6:8 6:9 6:9 6:10 6:10 6:13 2 Timothy 1:5 1:5 1:16 2:9 2:9 3:2 3:12 3:15 4:6 4:6 4:10 4:11 4:11 4:13 4:15 4:17 4:20 Titus 1:7-9 1:12 1:12 1:16 2:12 3:5 Philemon 1:1 1:2 1:2 1:9 1:22 5:13 Hebrews 1:5 1:14 2:2 2:2 5:11-12 6:9 8:11 8:13 9:16 9:26 9:26-28 10:12 10:24 10:28-29 10:28-29 10:29 10:34 10:37 11:31 12:2 12:24 12:29 13:3 13:3 13:10 13:17 13:17 13:21 13:22 13:24 James 1:9 1:18 2:6 2:23 3:4 4:6 5:14-15 5:17 1 Peter 3:21 ”
  14. Isaiah (Presbyterian) “Jamieson, Fausset & Brown on Isaiah 32:17: work--the effect (Pro 14:34; Jam 3:18). peace--internal and external.”
  15. CCEL (Reformed) “Calvin, Commentary on Isaiah, Vol. 1, section 29.2: 62:10 65:20 65:24 Jeremiah 1:6 1:17 2:21 2:21 7:4 7:4 7:21 7:22 9:23-24 9:26 10:14 17:5 17:5 22:7 23:5 23:19 23:36 25:11-12 29:10 30:9 30:9 31:34 32:18 33:15 41:5 48:7 48:13 48:29 48:30 48:32 48:32 48:32 48:34 Lamentations 2:22 3:22 Ezekiel 4:16 13:9 18:20 20:22 34:23 34:23 36:25 37:11-12 37:16 37:24 37:24 47:1 47:1 Daniel 2:44 7:10 7:14 7:27 9:24 9:27 Hosea 2:5 2:13 2:18 2:19-20 2:23 3:4 3:5 6:6 13:11 14:2 14:9 Joel 2:31 2:32 2:32 Amos 2:4-5 3:11 5:11 5:18 5:20 5:21 6:11 9:11 9:11 Jonah 1:2 3:10 Micah 1:16 5:10 6:7-8 7:8 Habakkuk 1:16 2:2 2:”
  16. CCEL/NPNF (Eastern Orthodox) “John Chrysostom, Homilies on Galatians–Colossians–Thessalonians: Index of Scripture References Genesis 1:11 1:11 1:26 1:26 1:26 1:27 1:27 1:27 1:31 1:31 2:2 2:7 2:17 2:17 2:18 2:23 2:24 2:24 2:24 3:5 3:16 3:24 4 4:9 4:14 6:2 6:3 6:4 6:9 6:12 7:7 8:21 12:1 12:4 12:16 13:10 13:10-11 14:14 14:21-23 15:16 16:5 16:6 17:8 18:11 18:12 18:14 18:21 19:13 19:14 19:24 21:10 21:12 21:12 22:7-8 22:16 22:18 22:18 24:1-67 24:22 24:65 25:21 25:21 26:4 27:46 28:1 28:13 31:42 31:45 32:48 35:18 37:9-10 37:20 39:1 39:6 40:4 40:7 40:8 40:14-15 40:22 41 41:16 42:36 43:14 43:30 45:5 48:15-16 49:9 64:28 Exodus 2:11 2”
  17. CCEL (Reformed) “Calvin, Commentary on Isaiah, Vol. 1, section 23.4: 29:10 30:9 30:9 31:34 32:18 33:15 41:5 48:7 48:13 48:29 48:30 48:32 48:32 48:32 48:34 Lamentations 2:22 3:22 Ezekiel 4:16 13:9 18:20 20:22 34:23 34:23 36:25 37:11 37:12 37:16 37:24 37:24 47:1 47:1 Daniel 2:44 7:10 7:14 7:27 9:24 9:27 Hosea 2:5 2:13 2:18 2:19 2:20 2:23 3:4 3:5 6:6 13:11 14:2 14:9 Joel 2:31 2:32 2:32 Amos 2:4 2:5 3:11 5:11 5:18 5:20 5:21 6:11 9:11 9:11 Jonah 1:2 3:10 Micah 1:16 5:10 6:7 6:8 7:8 Habakkuk 1:16 2:2 2:2 Zephaniah 1:5 1:7 Haggai 2:9 Zechariah 2:8 2:8 3:2 6:12 Malachi 2:10 4:3 4:4 Matthew 1:5 3:2 4:15 4:16 5:10 5:11 ”
  18. CCEL (Reformed) “Calvin, Commentary on Isaiah, Vol. 2, section 53.1: Index of Scripture References Genesis 1:1 1:27 1:27 3:17 3:17 3:18 4:11 4:13 4:14 6:5 7:11 8:1 10:4 10:11 11:29 11:31 11:31 12:1 12:1 12:17 14:6 14:16 15:1 17:7 17:7 19:24 19:37 20:2 20:8 20:14 21:2 21:5 25:1 25:14 25:14 27:38 27:38 32:3 32:10 32:12 36:8 36:9 Exodus 3:8 7:13 8:15 13:3 13:5 13:8 13:14 13:17 14:14 14:21 14:22 15:10 17 18:21 19:5 19:6 19:6 19:6 19:6 20:1 20:2 20:24 20:25 23:32 27:1 29:45 33:3 34:6 34:6 34:15 34:30 Leviticus 19:9 19:10 26:3-13 26:8 26:12 26:12 26:16 Numbers 3:1-4:49 10:36 12:6 13:22 23:19 24:13 30:3 32:34 Deutero”
  19. 1 Peter (Presbyterian) “Jamieson, Fausset & Brown on 1 Peter 3:15: sanctify--hallow; honor as holy, enshrining Him in your hearts. So in the Lord's Prayer, Mat 6:9. God's holiness is thus glorified in our hearts as the dwelling-place of His Spirit. the Lord God--The oldest manuscripts read "Christ." Translate, "Sanctify Christ as Lord." and--Greek, "but," or "moreover." Besides this inward sanctification of God in the heart, be also ready always to give, &c. answer--an apologetic answer defending your faith. to every man that asketh you--The last words limit the universality of the "always"; not to a roller, ”
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