This sermon, centered on Matthew 18:21–35, presents forgiveness as a limitless, costly, and heartfelt practice rooted in the gospel's transformative grace. It emphasizes that true forgiveness mirrors God's infinite mercy in Christ—where believers, having been forgiven vast debts of sin, are called to extend the same unbounded mercy to others, regardless of the offense. The parable of the unforgiving servant illustrates the hypocrisy of claiming divine forgiveness while withholding it from others, exposing the heart's deceitfulness and the danger of pride, bitterness, and unforgiveness. The sermon underscores that forgiveness is not a mere emotional response but a deliberate, Spirit-enabled act requiring humility, repentance, and reliance on Christ's strength, as exemplified by Corrie Ten Boom's experience. Ultimately, it calls the church to embody this radical grace as a living testimony to the world, demonstrating the power of the gospel through reconciling relationships and serving as a compelling witness to God's love.