In the prceding articles we've seen how Jesus’ divorce teaching (Matt 5:31–32) functions as a concrete instance of the broader “stumbling” principle articulated in Matthew 18:1–14. Yet the internal logic of Jesus’ ethic becomes even clearer when we consider the deeper causal sequence that underlies the divorce discourse in Matthew 5. Specifically, Jesus’ references to the “right eye” and “right hand” (Matt 5:29–30)—repeated only again in Matthew 18:8–9—provide interpretive clues that link divorce not merely to lust as an isolated vice but to a more fundamental posture of self-righteousness and over-reliance on self. When these elements are read in sequence, Matthew’s theological architecture forms a coherent chain of causality that both diagnoses the moral root and prescribes a path of repentance.
1. Self-righteousness and self-dependence as the root of relational rupture
Jesus’ mention of the “right eye” and “right hand” evokes not merely sensory desire but the culturally dominant side associated with strength, privilege, and agency. In this symbolic register, the “right” represents the self-assertive posture—confidence in one’s own judgment, resistance to mutual concession, and a refusal to be corrected. It is this posture, rather than lust per se, that constitutes the underlying spiritual problem. A person who esteems himself excessively, who refuses vulnerability or interdependence, naturally becomes inattentive to the needs of others, especially within marriage. As such, self-righteousness precedes and generates lust. Lust is thus not the primary cause of marital breakdown but the symptomatic outgrowth of a heart that has ceased to be humble.
2. Lust as symptom, not cause
Within this anthropology, lust is not an isolated moral failure but a predictable consequence of self-exaltation. A self-righteous heart seeks novelty, affirmation, and gratification without regard for sacrificial love. Consequently, Jesus’ call to “tear out” the offending eye or “cut off” the offending hand (Matt 5:29–30) addresses not merely the temptation toward sexual desire but the deeper need to amputate the proud impulses that make relational betrayal conceivable. This interpretation aligns with the observation that a truly repentant person—one fearful of being severed from God—cannot simultaneously nurture fantasies of replacement or superiority. Where humility is active, lust recedes; where pride reigns, lust becomes inevitable.
3. Divorce as the outward expression of inward arrogance
From this vantage, divorce—except in cases of sexual immorality—is not the root sin but the manifestation of the underlying disease. A self-righteous person who refuses mutual concession, who will not listen, sacrifice, or negotiate the complexities of covenantal union, will eventually view legal divorce as a permissible tool for reshaping life according to personal preference. The Mosaic concession, originally granted to restrain potential violence among the genuinely hard-hearted, is misappropriated by those who consider themselves righteous. In this sense, divorce becomes the outward crystallization of inward arrogance.
4. Forced adultery and the logic of causing sin (Matt 5:31–32)
The divorce initiated from such a posture triggers the tragic cascade Jesus identifies: the dismissed spouse—typically dependent and vulnerable—must often remarry simply to survive. This remarriage places her into a covenantally adulterous condition, not because of moral fault but because of the structure of her circumstances. Jesus therefore attributes causality to the divorcer: “he makes her commit adultery”. The remarriage is not an expression of the woman’s lust but a survival strategy imposed upon her by another’s decision. The divorcer thus becomes the agent of the adultery, aligning his action precisely with Jesus’ definition of causing another to stumble.
5. Causing a little one to stumble (Matt 18:6–7)
When Matthew 5 is read alongside Matthew 18, divorce emerges as the paradigmatic case of scandalizing a “little one.” The dependent spouse fits the definition of vulnerability emphasized in Matthew 18, and the divorcer fits the role of the powerful individual whose actions imperil the weak. The structural correspondence between the two chapters becomes unmistakable: the same admonition to amputate harmful impulses appears in both (Matt 5:29–30; Matt 18:8–9), indicating that Matthew views the logic of stumbling and the logic of divorce as two expressions of the same moral issue—the destruction wrought by unchecked self-assertion.
6. The millstone and the necessity of harsh mercy
Jesus’ threat of the millstone (Matt 18:6) is not gratuitous severity but a form of merciful triage. Better for the self-righteous person to be plunged into the humbling depths of symbolic “drowning” than to remain inflamed by pride that destroys both self and others. This harsh mercy aligns with Jesus’ consistent teaching that the exalted must be humbled and that repentance often requires a descent into humiliation. The millstone imagery signifies the breaking of pride necessary for restoration.
7. Humiliation as repentance: structural resonances with Qur’anic divorce law
This understanding of necessary humiliation finds a striking analogue in the Qur’anic regulation of triple divorce (Q 2:229–230). There, the divorcer cannot simply reclaim his former spouse without first enduring a structural humiliation: she must have lawfully married another and then been released. The divorcer must accept her back with diminished social standing, thus sharing the stigma he once imposed. This parallel demonstrates a similar moral logic: when humility is refused at the outset, it must eventually be embraced through a lower descent for the sake of salvation from greater destruction.
8. Synthesis: the full causal and redemptive arc
When the elements are placed in sequence, Matthew’s ethic reveals a comprehensive moral arc:
Self-righteousness → lust (as symptom) → divorce → causing adultery → stumbling a little one → millstone judgment → humility through repentance and, if necessary, imposed humiliation.
This arc exposes not only the severity of divorce but the spiritual mechanism beneath it: the collapse of humility that leads to violations of covenant, the endangerment of the vulnerable, and the eventual necessity of corrective descent. In this way, Jesus’ teachings in Matthew 5 and Matthew 18 form a unified critique of self-exaltation and a unified call to humility as the only path back to covenantal fidelity and the Kingdom of Heaven.