Marriage is central to Christian life and Nigerian society, yet many Christian couples face challenges such as poor communication, infidelity, economic pressure, patriarchal attitudes, extended-family interference, and domestic violence. This article examines forgiveness in Matthew 6:12 as a theological and practical tool for strengthening Christian marriage in Nigeria. The study therefore focuses primarily on Matthew 6:12 while considering its immediate context in Matthew 6:9–13. Using grammaticalsyntactical analysis, historical-literary interpretation, and contextual hermeneutics, the study examines the expressions aphes hçmin ta opheilçmata hçmôn (“forgive us our debts”) and hôs kai hçmeis aphçkamen tois opheiletais hçmôn (“as we also have forgiven our debtors”). The analysis shows that forgiveness is not presented as a choice of Christian lifestyle but as a deeper expression of discipleship. Those whom God has shown mercy are expected to express mercy to others. When forgiveness is properly applied to marriage, it can interrupt cycles of resentment, retaliation, emotional breakdown, and relational crises. Contemporary studies also identify forgiveness with marital satisfaction and healthier relationship patterns. However, forgiveness must not be confused with ignoring wrongdoing, restoring trust immediately, removing consequences, or remaining in an unsafe relationship. This distinction is particularly important in Nigeria, where research has shown that religious approaches to domestic violence can sometimes encourage victims to forgive without receiving adequate protection or accountability. The article argues that Christian marital forgiveness should be accompanied by truth, honesrty, repentance, accountability, justice, appropriate boundaries, and reconciliation where possible. Nigerian churches should therefore integrate forgiveness into premarital education, marital counselling, pastoral training, and family ministries. Properly understood, Matthew 6:12 provides a valuable framework for developing marriages characterized by mercy, humility, responsibility, relational restoration and mutual respect for each other among Christian couples.
Keywords: forgiveness, Matthew 6:12, Lord's Prayer, Christian marriage, Nigerian society, marital conflict, reconciliation, Greek syntax, pastoral theology, contextual hermeneutics.