Concept

Concupiscence

Intro

Why does becoming a Christian not make the pull toward sin go away? Honest believers ask this often, and quietly. They expected conversion to fix the inner battle. It did not. They still want things they should not want. They still feel the tug.

Christian theology has a name for that tug. It is concupiscence. The word comes from a Latin verb meaning "to desire intensely," and it points to the broken pattern of human desire after the Fall: a will that still leans toward created things in the wrong order, even after God has begun to heal it.

Concupiscence is not the same as sinful acts. It is the inner condition out of which sinful acts grow. James puts the sequence simply: desire conceives, then it gives birth to sin (James 1:14-15). Paul describes the same struggle from the inside in Romans 7: "the good that I would I do not."

Christians do not all agree on what to do with this. The Catholic tradition holds that concupiscence in the baptized is not itself sin; it is the tinder, and only consent ignites it into sin. The Reformed tradition holds that concupiscence is sin even when no act follows, because the tenth commandment forbids the coveting itself. The disagreement is real, and the page lays out both sides below.

Why does this matter outside theology class? Because it gives Christians a way to explain something every honest person notices: that even the morally serious are divided inside themselves. The Christian frame names this as a disorder to be healed, not just a wiring we have to accept. That diagnosis is part of why the gospel of grace, not self-help, is the cure on offer.

In full

The theological term (Latin concupiscentia, from con- + cupere, "to desire intensely") for the disordered desire for created goods that remains in fallen human nature even after baptism / regeneration, the persistent inclination of the human will toward sin, distinct from actual sinful acts but the inner condition out of which actual sins arise. The term is central to the doctrine of Original Sin in both Catholic and Reformed-Protestant theology, though the two traditions disagree on whether concupiscence in the regenerate is itself sinful (Reformed: yes, it is sinful even when not consented to; Catholic: it is the tinder of sin, fomes peccati, but not itself sinful unless consented to).

The concept matters apologetically because (a) it explains the empirical universality of moral struggle even in genuinely converted believers, (b) it grounds the Christian framework against perfectionist heresies (the claim that some Christians achieve sinlessness in this life), and (c) it provides the conceptual structure for understanding Paul's "the good that I would I do not" struggle in Romans 7.

The biblical witness

The term concupiscentia is the Vulgate's rendering of the Greek ἐπιθυμία epithymia ("desire," "lust"), typically negative when used absolutely (Rom 7:7-8; Col 3:5; 1 Thess 4:5; James 1:14-15; 1 Pet 4:3; 1 John 2:16-17), though epithymia can be neutral or positive in some contexts (Luke 22:15, Jesus's "epithymia to eat this Passover with you").

The doctrinally-foundational texts:

Romans 7:7-25, Paul's famous "I do not understand my own actions" passage. "I had not known sin, but by the law: for I had not known concupiscence (epithymian), except the law had said, Thou shalt not covet" (7:7); "For the good that I would I do not: but the evil which I would not, that I do" (7:19). The struggle Paul describes is the inner workings of concupiscence in the redeemed.
James 1:14-15, "every man is tempted, when he is drawn away of his own lust (epithymias), and enticed. Then when lust hath conceived, it bringeth forth sin", the concupiscence-sin sequence.
Galatians 5:17, "the flesh lusteth (epithymei) against the Spirit, and the Spirit against the flesh: and these are contrary the one to the other", the ongoing dual-pull in the redeemed.
1 John 2:16, "the lust of the flesh, and the lust of the eyes, and the pride of life", the three concupiscences of Catholic-mystical tradition.

The Augustinian doctrine

Augustine (On Marriage and Concupiscence I-II, c. 419 AD; Against Julian, c. 421) developed the foundational Western Christian doctrine of concupiscence in his anti-Pelagian polemics. Key claims:

Concupiscence is the post-Fall condition of the human will. Adam's pre-Fall will was rightly-ordered (loved God supremely, loved created goods subordinately). The Fall disordered the will, humans now spontaneously love created goods (food, sex, power, comfort) above God, and only through grace can the right ordering be partially restored.
Concupiscence is transmitted through ordinary procreation (Augustine's traducian-flavored hamartiology). This is the mechanism by which Adam's fallen nature passes to all his descendants.
Concupiscence remains in the baptized. Baptism removes the guilt of original sin but does not eliminate the inclination toward sin; that inclination is the lifelong battleground of sanctification.
Concupiscence is itself sin in some sense, even when not consented to, the disordered inclination is a privation of the right order that ought to exist. (This is the disputed claim that the Council of Trent and Reformed-Protestant theology divide on.)

Augustine's account became the foundation of the Western doctrine of Original Sin and the basis for the Reformed-Catholic dispute over baptismal grace.

The Catholic position (Trent and after)

The Council of Trent (1546, Decree on Original Sin) defined the Catholic doctrine:

Baptism truly removes original sin (the guilt of it); the reatus (debt of punishment) is wiped out.
Concupiscence remains in the baptized as the fomes peccati ("tinder of sin"), but is not itself sin; it is the occasion of sin only when consented to.
The persistence of concupiscence is for the agonistic purpose of allowing the believer to struggle and earn merit through resistance.

Catholic doctrine therefore distinguishes:

The inclination to disordered desire (concupiscence, post-baptismal, not sin)
The temptation that arises from that inclination (not sin)
The consent of the will to the disordered desire (this is mortal or venial sin depending on object and gravity)
The act that follows consent (the sin actualized externally)

The Reformed-Protestant position

The Reformers (Luther, Calvin, the Reformed scholastics) reject the Catholic distinction between concupiscence-as-inclination (not sin) and concupiscence-as-consent (sin). Their claim:

Concupiscence is itself sin, even when not consented to.
The 10th commandment ("Thou shalt not covet" / non concupisces) explicitly forbids the inclination, not just the consent or the act. If coveting (concupiscing) were not itself sinful, the 10th commandment would be empty.
Romans 7:7-25 makes this explicit: Paul says he is in bondage to sin in his flesh even as a regenerate apostle; the disordered inclination is sin in him.
The doctrine of simul iustus et peccator (Luther: "simultaneously righteous and sinner") presupposes that the indwelling concupiscence is sin (which Christ's righteousness covers but does not eliminate in this life).

The Westminster Confession of Faith (1647) VI.5: "This corruption of nature, during this life, doth remain in those that are regenerated; and although it be, through Christ, pardoned and mortified, yet both itself, and all the motions thereof, are truly and properly sin."

The pastoral and apologetic significance

1. Pastoral

The doctrine of concupiscence answers the most pressing pastoral question for genuinely converted Christians: "why do I still struggle with sin? Why doesn't conversion make it stop?" Answer: because concupiscence persists in this life, even in the regenerate. Sanctification is the lifelong partial mortification of concupiscence (Rom 8:13; Col 3:5); complete victory awaits the resurrection.

This protects against:

Perfectionism (the claim that some Christians achieve sinlessness in this life, the Wesleyan-holiness extreme, the various perfectionist sects)
Despair (the claim that ongoing struggle proves one is not really converted, the rigorist extreme)
Antinomianism (the claim that since concupiscence persists, sin doesn't matter, the libertine extreme)

2. Apologetic

The doctrine of concupiscence provides the Christian framework with empirical superiority over rival worldviews on the question "why is everyone, including the morally-serious, internally divided about doing right?" Atheist frameworks (evolutionary-psychology, social-construction) can describe the phenomenon but cannot explain it as a disorder, for them, the human will is just what evolution made it. Christianity diagnoses the phenomenon as fallenness and provides the resources (grace, sanctification, eschatological completion) for engaging it.

The doctrine also provides the framework for engaging the secular self-help / wellness culture's empirical failure: secular frameworks that promise to eliminate the internal struggle (Stoicism, mindfulness, optimization) consistently fail at the limit, the internal disorder is too deep to be self-managed. Christianity does not promise the elimination of struggle in this life; it promises the covering of concupiscence by Christ's righteousness now and the elimination of concupiscence in the resurrection.