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Assurance of Salvation for Believers in Christian Theology

Assurance of salvation refers to a believer's confidence that they are saved and will attain everlasting life [4]. This concept is rooted in biblical teachings and has been articulated in various ways across Christian traditions. The resurrection of Jesus Christ is presented as God's pledge that his revelation is true and worthy of acceptance, forming the basis of this assurance [1].

The New Testament uses the Greek word pistis, often translated as "faith," to describe this assurance [1]. For instance, Hebrews 10:22 speaks of the "full assurance of faith" (plerophoria), signifying a complete faith in God that leaves no room for doubt [1]. Similarly, Colossians 2:2 mentions the "full assurance of understanding," which is an unwavering conviction in the truth of Scripture's declarations [1]. This conviction brings a joyful steadfastness to those who believe they have grasped the truth [1].

Assurance is understood to be produced by faith, as seen in passages like Ephesians 3:12 and Hebrews 10:22 [2]. It is made full by hope (Hebrews 6:11, 19) and confirmed by love (1 John 3:14, 19; 4:18) [2]. The effect of righteousness also contributes to assurance (Isaiah 32:17), and it is abundant in the understanding of the gospel (Colossians 2:2; 1 Thessalonians 1:5) [2]. Believers are privileged to have assurance regarding their election (Psalm 4:3; 1 Thessalonians 1:4), redemption (Job 19:25), adoption (Romans 8:16; 1 John 3:2), salvation (Isaiah 12:2), and eternal life (1 John 5:13) [2]. This includes confidence in the unalienable love of God (Romans 8:38-39) and their union with God and Christ (1 Corinthians 6:15; 2 Corinthians 13:5; Ephesians 5:30; 1 John 2:5; 4:13) [2].

Salvation itself is described as the deliverance from the guilt and pollution of sin, a "great salvation" wrought by Jesus Christ [5]. It is made effectual to the individual through the power of the Holy Spirit [3]. This salvation is not earned by human actions but is a gift of God's grace through faith [9, 8]. Ephesians 2:8-9 states, "It is only by God’s grace that you have been saved," emphasizing that salvation is not a result of works [8]. Good works are seen as the result of salvation, not its cause, flowing from a transformed heart by God's Spirit [10, 14].

A significant aspect of assurance in some traditions is the doctrine of the perseverance of the saints. This doctrine posits that once justified and regenerated, a believer cannot totally or finally fall away from grace but will certainly persevere and attain everlasting life [4]. This view is supported by passages such as John 10:28-29, Romans 11:29, Philippians 1:6, and 1 Peter 1:5 [4]. It is also seen as a consequence of the immutability of divine decrees, the provisions of the covenant of grace, and the atoning work of Christ [4].

The believer's union with Christ is central to this assurance. Through this union, believers share in Christ's resurrection, both now and in the future [8, 13]. This means they are "created anew in Christ Jesus" [10], shedding their "old sinful nature" and putting on a "new nature" [12, 14]. This new identity signifies full acceptance into God's family, becoming children of God [11].

The apostle Paul expresses this confidence in Romans 1:16, stating, "For I am not ashamed of the Good News of Christ, for it is the power of God for salvation for everyone who believes" [6]. This salvation is "shielded by God’s power for the salvation that is ready to be revealed in the last time" (1 Peter 1:5) [7]. The experience of salvation is tied to believing in Christ as Savior and the belief in his resurrection [15]. Adam Clarke, a Methodist commentator, emphasizes that being "found in him" means not trusting in one's own righteousness but in the justification received through faith in Christ's atonement, which is God's method of justifying sinners [16]. The Christian life, therefore, is characterized by faith in Christ for salvation and love for fellow Christians as an expression of that salvation [17].

Sources

  1. Easton's Bible Dictionary “Easton's Bible Dictionary: Assurance — The resurrection of Jesus (Acts 17:31) is the "assurance" (Gr. pistis, generally rendered "faith") or pledge God has given that his revelation is true and worthy of acceptance. The "full assurance [Gr. plerophoria, full bearing'] of faith" (Heb. 10:22) is a fulness of faith in God which leaves no room for doubt. The "full assurance of understanding" (Col. 2:2) is an entire unwavering conviction of the truth of the declarations of Scripture, a joyful steadfastness on the part of any one of conviction that he has grasped the very truth. The "full assurance ”
  2. Torrey's Topical Textbook “Torrey's Topical Textbook: Assurance — Produced by faith -- Eph 3:12; 2Ti 1:12; Heb 10:22. Made full by hope -- Heb 6:11,19. Confirmed by love -- 1Jo 3:14,19; 4:18. Is the effect of righteousness -- Isa 32:17. Is abundant in the understanding of the gospel -- Col 2:2; 1Th 1:5. Saints privileged to have, of Their election. -- Ps 4:3; 1Th 1:4. Their redemption. -- Job 19:25. Their adoption. -- Ro 8:16; 1Jo 3:2. Their salvation. -- Isa 12:2. Eternal life. -- 1Jo 5:13. The unalienable love of God. -- Ro 8:38,39. Union with God and Christ. -- 1Co 6:15; 2Co 13:5; Eph 5:30; 1Jo 2:5; 4:13. Peace with ”
  3. Easton's Bible Dictionary “Easton's Bible Dictionary: Saviour — One who saves from any form or degree of evil. In its highest sense the word indicates the relation sustained by our Lord to his redeemed ones, he is their Saviour. The great message of the gospel is about salvation and the Saviour. It is the "gospel of salvation." Faith in the Lord Jesus Christ secures to the sinner a personal interest in the work of redemption. Salvation is redemption made effectual to the individual by the power of the Holy Spirit.”
  4. Easton's Bible Dictionary “Easton's Bible Dictionary: Perseverance of the saints — Their certain continuance in a state of grace. Once justified and regenerated, the believer can neither totally nor finally fall away from grace, but will certainly persevere therein and attain everlasting life. This doctrine is clearly taught in these passages, John 10:28, 29; Rom. 11:29; Phil. 1:6; 1 Pet. 1:5. It, moreover, follows from a consideration of (1) the immutability of the divine decrees (Jer. 31:3; Matt. 24:22-24; Acts 13:48; Rom. 8:30); (2) the provisions of the covenant of grace (Jer. 32:40; John 10:29; 17:2-6); (3) the ato”
  5. Easton's Bible Dictionary “Easton's Bible Dictionary: Salvation — This word is used of the deliverance of the Israelites from the Egyptians (Ex. 14:13), and of deliverance generally from evil or danger. In the New Testament it is specially used with reference to the great deliverance from the guilt and the pollution of sin wrought out by Jesus Christ, "the great salvation" (Heb. 2:3). (See [546]REDEMPTION; [547]REGENERATION.)”
  6. Romans “For I am not ashamed of the Good News of Christ, for it is the power of God for salvation for everyone who believes; for the Jew first, and also for the Greek. -- Romans 1:16”
  7. I Peter “I Peter 1:5 (BSB) — who through faith are shielded by God’s power for the salvation that is ready to be revealed in the last time.”
  8. Ephesians (Protestant academic) “Tyndale House on Ephesians 2:5: 2:5 gave us life when he raised Christ from the dead (literally made us alive together with Christ): Joined with Christ, believers share in his resurrection, now and in the future (see 2:6; Rom 6:4-14; Col 3:1-4). • It is only by God’s grace that you have been saved: See Eph 1:2; 2:8-9.”
  9. Titus (Protestant academic) “Tyndale House on Titus 3:5: 3:5 not because . . . but because: The contrast is between human actions that might be thought to merit salvation and God’s grace (see Gal 2:16). Salvation is through faith in God’s mercy alone (Eph 2:8). • He washed away our sins, giving us a new birth: See Ezek 16:9; John 3:1-15; Eph 5:26; Heb 10:22; 2 Pet 1:9. • and new life through the Holy Spirit: This signifies a complete departure from the life of sin and death and a transfer into the realm of life and purity (see also Rom 12:2; 2 Cor 5:17; Col 3:10).”
  10. Ephesians (Protestant academic) “Tyndale House on Ephesians 2:10: 2:10 He has created us anew in Christ Jesus, so we can do the good things he planned for us: Good works are the result, not the cause, of salvation. God’s Spirit, working through a transformed heart, produces a good life (Gal 5:22-23).”
  11. Ephesians (Protestant academic) “Tyndale House on Ephesians 2:19: 2:19 Gentiles who believe are no longer strangers and foreigners (2:11-12, 17). Through Christ, they are fully accepted into God’s family. They become children of God, just like believing Jews (see Rom 8:14-17).”
  12. Colossians (Protestant academic) “Tyndale House on Colossians 3:9: 3:9-10 your old sinful nature . . . your new nature: Paul contrasts old and new identities (see also Rom 5:12-21; 6:6; Eph 4:22-24). Believers strip off their old life and put on Christ’s new life, allowing him to be Lord and to guide the way they live.”
  13. Ephesians (Protestant academic) “Tyndale House on Ephesians 2:6: 2:6 united with Christ Jesus: Because of this union, believers share God’s glory and blessings, and experience resurrection both now and in the future (see Rom 6:4-14; Col 2:12-13; 3:1-4).”
  14. Ephesians (Protestant academic) “Tyndale House on Ephesians 4:24: 4:24 A believer has a new nature: God’s Spirit expresses his life within the believer (see Col 3:10; cp. Gen 1:26; Rom 12:1-2; Gal 5:22-23). The transforming work of God’s Spirit is part of the gift of salvation (Eph 2:8-10).”
  15. 1 Corinthians (Baptist/Reformed) “John Gill on 1 Corinthians 15:2: By which also ye are saved,.... It was the means of their salvation, and had been made the power of God unto salvation to them. Salvation is inseparably connected with true faith in Christ as a Saviour, and with a hearty belief of his resurrection from the dead, which is the earnest and pledge of the resurrection of the saints; and because of the certainty of it in the promise of God, through the obedience and death of Christ, and in the faith and hope of believers, which are sure and certain things, they are said to be saved already. To which the apostle puts ”
  16. Philippians (Methodist/Wesleyan) “Adam Clarke on Philippians 3:9: And be found in him - Be found a believer in Christ, not having mine own righteousness - not trusting in any thing I have done or could do, in order to my salvation; relying on no scheme of justification, set up either formerly by myself or by others. But that which is through the faith of Christ - That justification which is received by faith through the atonement made by Christ. The righteousness which is of God - God's method of justifying sinners through faith in his Son. See the notes on Rom 3:21, Rom 3:23 (note), Rom 3:25 (note), where this subject is trea”
  17. Phlm (Protestant academic) “Tyndale House on Phlm 1:5: 1:5 It is by faith in Christ that we are saved, and it is by love for fellow Christians that we live out our salvation.”
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