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Assurance of Eternal Life in Scripture and Theology

Assurance of eternal life refers to the conviction held by believers that they will receive everlasting salvation and fellowship with God [6]. This concept is deeply rooted in biblical teaching and has been a significant point of theological discussion across Christian traditions.

The Bible frequently speaks of "eternal life" as the ultimate reward for the redeemed, contrasting it with "eternal punishment" [1, 4]. This life is described as the "whole future of the redeemed" and their "Sabbath of rest" [1]. The Old Testament implies the doctrine of immortality, particularly in later books like Psalms and Isaiah, and it was a known concept among Jews [2]. The New Testament brings this doctrine "to light" more fully, especially in passages like 2 Timothy 1:10 and 1 Corinthians 15 [2].

Eternal life is presented as a gift from God, given through Christ [5, 12]. John 17:3 states that "to know God and Christ is eternal life" [5]. Believing in Christ is consistently linked to receiving eternal life (John 3:15-16, 6:40, 6:47) [5]. Adam Clarke, a Methodist commentator, notes that those who believe in Christ are "entitled to this [everlasting life], on his believing me to be the Messiah, and trusting in me alone for salvation" [13]. The promise of eternal life is made certain by God, who is "ever true" (Titus 1:2 BBE) [7].

The Holy Spirit plays a crucial role in providing assurance. The Spirit is described as God's guarantee of future blessings and a "foretaste of eternal life and power" [10]. This inheritance includes everything God has promised to believers [10]. The "full assurance of faith" (Hebrews 10:22) is a complete faith in God that leaves no room for doubt [3]. This assurance is produced by faith, made full by hope, and confirmed by love [6]. It is also an effect of righteousness and is abundant in the understanding of the gospel [6].

Different theological traditions emphasize various aspects of this assurance. John Gill, a Baptist commentator, highlights that eternal life is a "pure free grace gift of God the Father" [12]. He also notes that the spiritual life of a believer is "hid and preserved in Christ," ensuring they "shall never die the second death" [9]. Jamieson, Fausset, and Brown, in their Presbyterian commentary, connect the promise of eternal life to "abiding in the Son and in the Father" [8]. Adam Clarke emphasizes that eternal life is a "right to endless glory, and a meetness for it," which comes "by and through him [Christ]" [11]. one tradition asserts that "no other scheme of salvation can be effectual" [11].

The concept of assurance extends beyond eternal life to other aspects of a believer's relationship with God. Saints are privileged to have assurance of their election, redemption, adoption, and salvation, as well as the unalienable love of God and union with God and Christ [6]. This conviction is not merely intellectual but involves a "joyful steadfastness" in the truth of Scripture [3]. The "full assurance of understanding" (Colossians 2:2) signifies an unwavering conviction of biblical declarations [3].

Sources

  1. Easton's Bible Dictionary “Easton's Bible Dictionary: Eternal life — This expression occurs in the Old Testament only in Dan. 12:2 (R.V., "everlasting life"). It occurs frequently in the New Testament (Matt. 7:14; 18:8, 9; Luke 10:28; comp. 18:18). It comprises the whole future of the redeemed (Luke 16:9), and is opposed to "eternal punishment" (Matt. 19:29; 25:46). It is the final reward and glory into which the children of God enter (1 Tim. 6:12, 19; Rom. 6:22; Gal. 6:8; 1 Tim. 1:16; Rom. 5:21); their Sabbath of rest (Heb. 4:9; comp. 12:22). The newness of life which the believer derives from Christ (Rom. 6:4) is the ”
  2. Easton's Bible Dictionary “Easton's Bible Dictionary: Immortality — Perpetuity of existence. The doctrine of immortality is taught in the Old Testament. It is plainly implied in the writings of Moses (Gen. 5:22, 24; 25:8; 37:35; 47:9; 49:29, comp. Heb. 11:13-16; Ex. 3:6, comp. Matt. 22:23). It is more clearly and fully taught in the later books (Isa. 14:9; Ps. 17:15; 49:15; 73:24). It was thus a doctrine obviously well known to the Jews. With the full revelation of the gospel this doctrine was "brought to light" (2 Tim. 1:10; 1 Cor. 15; 2 Cor. 5:1-6; 1 Thess. 4:13-18).”
  3. 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 ”
  4. Easton's Bible Dictionary “Easton's Bible Dictionary: Eternal death — The miserable fate of the wicked in hell (Matt. 25:46; Mark 3:29; Heb. 6:2; 2 Thess. 1:9; Matt. 18:8; 25:41; Jude 1:7). The Scripture as clearly teaches the unending duration of the penal sufferings of the lost as the "everlasting life," the "eternal life" of the righteous. The same Greek words in the New Testament (aion, aionios, aidios) are used to express (1) the eternal existence of God (1 Tim. 1:17; Rom. 1:20; 16:26); (2) of Christ (Rev. 1:18); (3) of the Holy Ghost (Heb. 9:14); and (4) the eternal duration of the sufferings of the lost (Matt. 25”
  5. Torrey's Topical Textbook “Torrey's Topical Textbook: Life, Eternal — Christ is -- 1Jo 1:2; 5:20. Revealed by Christ -- Joh 6:68; 2Ti 1:10. To know God and Christ is -- Joh 17:3. Given By God. -- Ps 133:3; Ro 6:23. By Christ. -- Joh 6:27; 10:28. In Christ. -- 1Jo 5:11. Through Christ. -- Ro 5:21; 6:23. To all given to Christ. -- Joh 17:2. To those who believe in God. -- Joh 5:24. To those who believe in Christ. -- Joh 3:15,16; 6:40,47. To those who hate life for Christ. -- Joh 12:25. In answer to prayer. -- Ps 21:4. Revealed in the Scriptures -- Joh 5:39. Results from Drinking the water of life. -- Joh 4:14. Eating the ”
  6. 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 ”
  7. Titus “Titus 1:2 (BBE) — In the hope of eternal life, which was made certain before eternal time, by the word of God who is ever true;”
  8. 1 John (Presbyterian) “Jamieson, Fausset & Brown on 1 John 2:25: this is the promise--Eternal life shall be the permanent consummation of thus abiding in the Son and in the Father (Jo1 2:24). he--Greek, "Himself," Christ, "the Son" (compare Jo1 1:1). promised-- (Joh 3:15, Joh 3:36; Joh 6:40, Joh 6:47, Joh 6:57; Joh 17:2-3).”
  9. Psalms (Baptist/Reformed) “John Gill on Psalms 41:2: The Lord will preserve him and keep him alive,.... Amidst a thousand deaths, to which he is exposed for making a profession of his faith in Christ; see Co2 1:10; or this may refer to his spiritual life, which is hid and preserved in Christ, in whom he believes; and is safe and secure; because Christ lives he shall live also, and shall never die the second death, nor be hurt by it, but shall have everlasting life; and he shall be blessed upon the earth; with temporal blessings; for whatever he has, be it more or less, he has it with the blessing of God, and as a bles”
  10. Ephesians (Protestant academic) “Tyndale House on Ephesians 1:14: 1:14 The Spirit is both God’s guarantee of future blessings and a foretaste of eternal life and power. The believer’s eternal inheritance includes everything he promised (see also 1:18; Rom 8:17; 2 Cor 1:22; 5:5; Gal 3:29; 4:7; Col 1:12; 3:24; Titus 3:7).”
  11. 1 John (Methodist/Wesleyan) “Adam Clarke on 1 John 5:11: This is the record - The great truth to which the Spirit, the water, and the blood bear testimony. God hath given us eternal life - a right to endless glory, and a meetness for it. And this life is in his Son; it comes by and through him; he is its author and its purchaser; it is only in and through Him. No other scheme of salvation can be effectual; God has provided none other, and in such a case a man's invention must be vain.”
  12. 1 John (Baptist/Reformed) “John Gill on 1 John 5:11: And this is the record,.... The sum and substance of it, with respect to the person of Christ, and the security of salvation in him, who is the true God, and eternal life: that God hath given to us eternal life; which is a life of glory and happiness hereafter; in the present state is unseen, but will in the world to come be a life of vision, free from all the sorrows and imperfections of this; and will be of the utmost perfection and pleasure, and for ever. This is a pure free grace gift of God the Father, proceeding from his sovereigns good will and pleasure, and ”
  13. John (Methodist/Wesleyan) “Adam Clarke on John 6:47: Hath everlasting life - He is entitled to this, on his believing me to be the Messiah, and trusting in me alone for salvation. Our blessed Lord recapitulates here what he had said in the preceding discourse. The person who is saved is, 1. drawn by the Father; 2. hears his instructions; 3. accepts the salvation offered; 4. is given to Christ Jesus, that he may be justified by faith; 5. is nourished by the bread of life; 6. perseveres in the faith; 7. is not lost, but is raised up at the last day; and 8. is made a partaker of eternal life.”
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