Penitence is the action of feeling or expressing humble sorrow and regret for sins or errors, mostly in a religious context. It is remorse for past conduct, usually sin before God. Repentance is a close cousin of penitence. The English definition of repentance is a feeling of regret or remorse for doing wrong or sinning, leading to the action of changing one's behavior. The biblical definition is heavily weighted toward changing both thinking and conduct. When those two are put together, repentance in the Bible is oriented toward overcoming and growing, not just change for change's sake, but changing that leads to something better. That is, of course, having the mind and character of Jesus Christ. The penitent person is the one who feels guilty for his sins and usually the figure one thinks of when thinking of a penitent person is a person down on his knees, begging for forgiveness. Penitential psalms are distinguished by their expression of remorse over sin and spiritual failure. In them the psalmist acknowledges his wrongdoing and at the same time recognizes how dependent he is on God's favor and how much only God can forgive him. Only God can bring him out of the terrible place he has fallen to. Only God can lift him up. Because of this, because he cannot do anything for himself, he pleads with God for relief from his profound guilt because he understands not only that God is the only one that can help him, but the enemies that he is fighting at the moment are not an external enemy that he could kill with a sword or a spear, but it is himself. It is what he is inside. It is an enemy that only God can face and put down, and then turn the sinner around and restore him to a place of grace. The guilt is rooted in his spiritual condition, which means that only God can solve the problem for him. It is through forgiveness, God's mercy. Traditionally there are only seven penitential psalms across all one hundred fifty psalms. These are psalms 6, 32, 38, 51, 102, 130, and 143. This genre is based on thematic content, not on structure. It is not a literary format. It is just the content of the psalmist expressing his remorse for sin so the structures can vary. Psalm 51 is the most profound expression of contrition and pleading for forgiveness in the Old Testament. This psalm illustrates authentic contrition and repentance not just remorse for sin, but moving on to change so that God will be pleased with the person's righteousness. David does this through five distinct elements. He appeals to God's mercy. He confesses sin. He requests purification and restoration. He vows to teach others. He promises thanksgiving to God or he specifically gives thanksgiving to God. David in this psalm models a New Testament perspective of repentance. David minimizes external rituals like public sacrifices and public confessions of sin, as really rituals mean nothing without genuine internal contrition toward God. He shows very starkly his internal remorse and desire for forgiveness because he is feeling wretched and he does not want to feel that way anymore. He feels like he has rebelled against God. He feels like he has let Him down, and he wants to be back on a good relationship with Him. He bares his soul to God and just says, God, it is up to You. He is willing to change. He wants to be forgiven so he can get rid of this great burden of sin and guilt so he can move forward and do what God wants him to do, follow His path. The contrition is great. It is something that one should do. One should be remorseful and sorrowful about one's sins, and one must actively seek forgiveness from God, but then one must translate that into changed behavior. It is not good enough just to be forgiven and then go back into one's sins. That is a horrible way to act before God. But that change must happen. The change in character, the change in the internal way one looks at God, that has to change. One has to be more devout. One has to be more willing to do what He say

Penitence forms the etymological and conceptual foundation for understanding what true repentance actually requires. The English word "repentance" derives from the Latin penitere, meaning "to make sorry," and is closely related to "penitence," defined as contrition leading to a change of behavior—itself a distant relative of the word "pain." This linguistic background reveals that authentic repentance is never a light or easy matter; it involves genuine emotional pain because it demands changing ingrained attitudes, beliefs, and behaviors that have hardened like concrete over a lifetime. Any repentance that comes without difficulty is suspect, since failing to feel real pain in the process likely indicates that a person has not truly grasped the depths of his own sinful nature. This understanding of penitence connects directly to the broader teaching that true, salvation-worthy repentance can only begin after God initiates a relationship with a person, since human nature otherwise compels people away from the path leading to God's Kingdom. Once God calls someone and that person believes and vows to seek Him and His Kingdom, genuine change becomes possible—but this change is never merely a surface-level emotional reaction. The Hebrew word naham, meaning "to be sorry" or "to rue," illustrates this emotional dimension, particularly as it describes God's own regret in rare instances, such as when He regretted having made Saul king over Israel after Saul's disobedience regarding the Amalekites. Since God is perfect, this "repentance" is better understood as relenting or regretting rather than repentance in the human sense. The essence of naham relates to breathing strongly, as a person overwhelmed by sorrow might take deep breaths that descend into sobbing or painful wails of remorse—demonstrating the strong emotional character embedded in this concept. However, penitence alone does not constitute true repentance, since true repentance is not merely an emotional experience or outburst of regret. Judas's remorse in Matthew 27:3-5 exemplifies emotional sorrow that, despite being genuine feeling, was not true repentance—it led only to his death rather than restoration. By contrast, the Corinthian example demonstrates godly sorrow that produces determination to resolve wrongdoing, clear oneself of guilt, and generate further righteous responses such as anger at sin and fear of just punishment. The truly penitent person is driven to confront and overcome the problem in order to be vindicated through Christ. Thus, while regret and emotional pain are essential components of repentance, penitence must give way to these deeper transformative qualities in order to complete the process of true biblical repentance.

Fasting, especially as practiced on the Day of Atonement, is presented as far more than mere abstention from food and water; it is fundamentally connected to penitence—the humbling of the self before God in recognition of sin and total dependence on His mercy. Leviticus 23 and 16 establish that the Day of Atonement centers on three elements: fasting, refraining from all work, and the sacrificial ritual of the two goats, which together depict the payment for sin through Christ and the complete removal of sin from the sinner. Unlike other holy days, which prohibit only "customary" work, Atonement forbids "all work," signifying that human beings contribute nothing to the actual work of reconciliation with God—Christ alone accomplishes it. The only human "work" required is to afflict the soul, to be humble and contrite, positioning oneself rightly before God who provides everything, including eternal life. Isaiah 57 lays the groundwork for understanding true penitence by contrasting God's high and lofty nature with His choice to dwell among the humble and contrite in order to revive them. God declares He will not contend forever, since human spirit and soul would fail under continued conflict with Him; therefore He seeks correction that leads to healing rather than continued backsliding. He offers peace both to those far off—identified as the penitent who are turning back—and to those near, provided they remain humble. Isaiah 58 then exposes false fasting: the people fasted outwardly while pursuing self-interest, oppressing laborers, provoking strife, and expecting God's favor without genuine humility. Such fasting, marked by pride and self-righteousness, is rejected. True fasting instead requires two things: freeing others (and first oneself) from the burdens of sin, and performing practical good works—feeding the hungry, sheltering the outcast, clothing the naked—understood also in spiritual terms as preaching truth, welcoming the excluded, and strengthening others in righteousness. Genuine penitence, then, is inseparable from both inward humility and outward compassion. The reward for such authentic, penitent fasting is described in overflowing terms: light, healing, righteousness going before the penitent, God as rear guard, answered prayer, guidance, strength, and restoration. This entire pattern—recognizing sin, humbling oneself, depending wholly on God, and extending that humility into acts of love—embodies the true meaning of penitence as the proper human response to God's work of atonement.