The Nature of Sin in Humanity's Heart and Mind

Sin is defined as any lack of conformity to or transgression of God's law ^[1]. This includes not only outward actions but also the inward state and habits of the soul, whether through omission or commission ^[1]. The Bible describes sin as an offense against a personal lawgiver and moral governor, leading to a consciousness of its intrinsic vileness and deserved punishment ^[1].

The origin of sin in humanity is traced back to the disobedience of Adam, through whom sin entered the world, bringing death to all humanity ^{[5, 9]}. This initial act of disobedience was not merely eating a forbidden fruit, but a profound act of self-love, dishonor to God, ingratitude, and a preference for the creature over the Creator ^[15]. The temptation came from the devil ^[5]. As a result of the Fall, humanity is born in sin, described as children of wrath, with hearts that are inherently evil, blinded, corrupt, perverse, and lacking understanding ^[5].

The heart, in biblical understanding, is the center of all human life and spiritual activity ^[10]. It is from the heart that evil thoughts, murders, adulteries, sexual sins, thefts, false testimony, and blasphemies originate ^{[2, 3, 7]}. This indicates that sin is not merely an external act but stems from an internal disposition ^[7]. The corruption of human nature is so profound that sin is described as being "woven into our nature" and "bound" to the heart of children from birth ^[19]. All human beings are born sinners, and while the wicked indulge this sinful nature, the godly strive against it ^[13].

Sin is further characterized as a transgression of God's law ^[7]. It is associated with the devil, who "sinneth from the beginning" ^{[7, 14]}. Augustine, as cited by Jamieson, Fausset & Brown, notes that while one can be "born of God," the devil does not "beget" in the same way, but rather corruption comes from him, and those who imitate him become his children ^[14]. All unrighteousness is considered sin, and even the omission of known good acts is sin ^[7]. Anything not done in faith is also sin ^[7]. The thought of foolishness is sin, and all the imaginations of the unrenewed heart are sinful ^[7].

The nature of sin is described as malignant and epidemic, putting contempt on the honor of God, with a form of practical atheism at its root ^[17]. It is rebellion against God ^{[7, 16]}. The Bible portrays sin as "dead works" and "works of darkness" ^[7]. James 1:15 explains the progression of sin: lust conceives, bears sin, and when full-grown, sin produces death ^{[6, 7]}. The apostle Paul describes himself as "carnal, sold under sin," acknowledging the spiritual nature of the law in contrast to his own sinful state ^[4].

The universal sinfulness of humanity is a foundational concept, with both Gentiles and Jews being "under sin’s power" and unable to find favor with God through their own actions ^[18]. God's anger is presented not as an arbitrary emotional outburst, but as a necessary, holy response to sin ^[18]. The "sting of death is sin," and the power of sin is the law ^[8].

Despite the pervasive nature of sin, the concept of a "new birth" is presented as a necessary remedy for the corruption of human nature ^[12]. This new birth is effected by God, Christ, and the Holy Spirit, often through the instrumentality of God's word ^[12]. It is described as a new creation and newness of life ^[12]. The conscience, an inborn sense of right and wrong, is common to all people but has been perverted by the Fall ^[11]. It can become "defiled" or "seared," highlighting the deep impact of sin on human faculties ^[11]. The pursuit of a "conscience void of offense" is encouraged ^[11]. Confession of sins, stemming from a deep sense of guilt and helplessness, is presented as a path to mercy and cleansing from unrighteousness, as God is faithful to His promises and just through Christ's atonement ^[20].

Sources

Easton's Bible Dictionary “Easton's Bible Dictionary: Sin — Is "any want of conformity unto or transgression of the law of God" (1 John 3:4; Rom. 4:15), in the inward state and habit of the soul, as well as in the outward conduct of the life, whether by omission or commission (Rom. 6:12-17; 7:5-24). It is "not a mere violation of the law of our constitution, nor of the system of things, but an offence against a personal lawgiver and moral governor who vindicates his law with penalties. The soul that sins is always conscious that his sin is (1) intrinsically vile and polluting, and (2) that it justly deserves punishment,”
Mark “For from within, out of the hearts of men, proceed evil thoughts, adulteries, sexual sins, murders, thefts, -- Mark 7:21”
Matthew “For out of the heart come evil thoughts, murders, adulteries, sexual sins, thefts, false testimony, and blasphemies. -- Matthew 15:19”
Romans “Romans 7:14 (Geneva1599) — For we knowe that the Law is spirituall, but I am carnall, solde vnder sinne.”
Torrey's Topical Textbook “Torrey's Topical Textbook: Fall of Man, The — By the disobedience of Adam -- Ge 3:6,11,12; Ro 5:12,15,19. Through temptation of the devil -- Ge 3:1-5; 2Co 11:3; 1Ti 2:14. Man in consequence of Made in the image of Adam. -- Ge 5:3; 1Co 15:48,49. Born in sin. -- Job 15:14; 25:4; Ps 51:5; Isa 48:8; Joh 3:6. A child of wrath. -- Eph 2:3. Evil in heart. -- Ge 6:5; 8:21; Jer 16:12; Mt 15:19. Blinded in heart. -- Eph 4:18. Corrupt and perverse in his ways. -- Ge 6:12; Ps 10:5; Ro 3:12-16. Depraved in mind. -- Ro 8:5-7; Eph 4:17; Col 1:21; Tit 1:15. Without understanding. -- Ps 14:2,3; Ro 3:11; 1:31. ”
James “Then the lust, when it has conceived, bears sin; and the sin, when it is full grown, produces death. -- James 1:15”
Torrey's Topical Textbook “Torrey's Topical Textbook: Sin — Is the transgression of the law -- 1Jo 3:4. Is of the devil -- 1Jo 3:8; Joh 8:44. All unrighteousness is -- 1Jo 5:17. Omission of what we know to be good is -- Jas 4:17. Whatever is not of faith is -- Ro 14:23. The thought of foolishness is -- Pr 24:9. All the imaginations of the unrenewed heart are -- Ge 6:5; 8:21. Described as Coming from the heart. -- Mt 15:19. The fruit of lust. -- Jas 1:15. The sting of death. -- 1Co 15:56. Rebellion against God. -- De 9:7; Jos 1:18. Works of darkness. -- Eph 5:11. Dead works. -- Heb 6:1; 9:14. The abominable thing that Go”
1 Corinthians “The sting of death is sin, and the power of sin is the law. -- 1 Corinthians 15:56”
Romans “Therefore as sin entered into the world through one man, and death through sin; and so death passed to all men, because all sinned. -- Romans 5:12”
Easton's Bible Dictionary “Easton's Bible Dictionary: Heart — According to the Bible, the heart is the centre not only of spiritual activity, but of all the operations of human life. "Heart" and "soul" are often used interchangeably (Deut. 6:5; 26:16; comp. Matt. 22:37; Mark 12:30, 33), but this is not generally the case. The heart is the "home of the personal life," and hence a man is designated, according to his heart, wise (1 Kings 3:12, etc.), pure (Ps. 24:4; Matt. 5:8, etc.), upright and righteous (Gen. 20:5, 6; Ps. 11:2; 78:72), pious and good (Luke 8:15), etc. In these and such passages the word "soul" could not ”
Easton's Bible Dictionary “Easton's Bible Dictionary: Conscience — That faculty of the mind, or inborn sense of right and wrong, by which we judge of the moral character of human conduct. It is common to all men. Like all our other faculties, it has been perverted by the Fall (John 16:2; Acts 26:9; Rom. 2:15). It is spoken of as "defiled" (Titus 1:15), and "seared" (1 Tim. 4:2). A "conscience void of offence" is to be sought and cultivated (Acts 24:16; Rom. 9:1; 2 Cor. 1:12; 1 Tim. 1:5, 19; 1 Pet. 3:21).”
Torrey's Topical Textbook “Torrey's Topical Textbook: New Birth, The — The corruption of human nature requires -- Joh 3:6; Ro 8:7,8. None can enter heaven without -- Joh 3:3. Effected by God. -- Joh 1:13; 1Pe 1:3. Christ. -- 1Jo 2:29. The Holy Spirit. -- Joh 3:6; Tit 3:5. Through the instrumentality of The word of God. -- Jas 1:18; 1Pe 1:23. The resurrection of Christ. -- 1Pe 1:3. The ministry of the gospel. -- 1Co 4:15. Is of the will of God -- Jas 1:18. Is of the mercy of God -- Tit 3:5. Is for the glory of God -- Isa 43:7. Described as A new creation. -- 2Co 5:17; Ga 6:15; Eph 2:10. Newness of life. -- Ro 6:4. A spir”
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).”
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”
Genesis (Presbyterian) “Jamieson, Fausset & Brown on Genesis 3:13: beguiled--cajoled by flattering lies. This sin of the first pair was heinous and aggravated--it was not simply eating an apple, but a love of self, dishonor to God, ingratitude to a benefactor, disobedience to the best of Masters--a preference of the creature to the Creator.”
Psalms (Protestant academic) “Tyndale House on Psalms 19:13: 19:13 An individual who commits deliberate sins does so with an insolent (86:14) or arrogant (119:21, 69) attitude. • The great sin is rebellion (see 32:1).”
Psalms (Nonconformist/Puritan) “Matthew Henry on Psalms 14:1: If we apply our hearts as Solomon did (Ecc 7:25) to search out the wickedness of folly, even of foolishness and madness, these verses will assist us in the search and will show us that sin is exceedingly sinful. Sin is the disease of mankind, and it appears here to be malignant and epidemic. 1. See how malignant it is (Psa 14:1) in two things: - (1.) The contempt it puts upon the honour of God: for there is something of practical atheism at the bottom of all sin. The fool hath said in his heart, There is no God. We are sometimes tempted to think, "Surely there ne”
Romans (Protestant academic) “Tyndale House on Romans 1:18: 1:18–3:20 Paul delays exploring the theme of righteousness through faith (see 3:21) until after he first teaches about universal sinfulness. Gentiles (1:18-32) and Jews (2:1–3:8) are equally under sin’s power and cannot find favor with God by any action of their own (3:9-20). 1:18 God’s anger is not a spontaneous emotional outburst, but the holy God’s necessary response to sin. The Old Testament often depicts God’s anger (Exod 32:10-12; Num 11:1; Jer 21:3-7) and predicts a decisive outpouring of God’s wrath on human sin at the end of history. While Paul usually de”
Proverbs (Nonconformist/Puritan) “Matthew Henry on Proverbs 22:15: We have here two very sad considerations: - 1. That corruption is woven into our nature. Sin is foolishness; it is contrary both to our right reason and to our true interest. It is in the heart; there is an inward inclination to sin, to speak and act foolishly. It is in the heart of children; they bring it into the world with them; it is what they were shapen and conceived in. It is not only found there, but it is bound there; it is annexed to the heart (so some); vicious dispositions cleave closely to the soul, are bound to it as the cion to the stock into whi”
1 John (Methodist/Wesleyan) “Adam Clarke on 1 John 1:9: If we confess our sins - If, from a deep sense of our guilt, impurity, and helplessness, we humble ourselves before God, acknowledging our iniquity, his holiness, and our own utter helplessness, and implore mercy for his sake who has died for us; he is faithful, because to such he has promised mercy, Psa 32:5; Pro 28:13; and just, for Christ has died for us, and thus made an atonement to the Divine justice; so that God can now be just, and yet the justifier of him who believeth in Jesus. And to cleanse us from all unrighteousness - Not only to forgive the sin, but to”

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