Forgiveness lies at the heart of Christian spirituality, serving as a crucial element in the journey toward spiritual maturity and sanctity. It is a concept so profound that its implications stretch across both the human and divine realms, calling Christians not only to forgive others but to seek forgiveness for their own offenses. At its core, forgiveness is a radical act of love—love that mirrors God's infinite mercy toward humanity. The foundation of forgiveness in the Catholic tradition can be traced directly to the life and teachings of Jesus Christ, but it also finds its roots deep within the ancient Scriptures and is reinforced through the writings of the Church Fathers, the insights of the Doctors of the Church, and the lives of the saints. In this chapter, we will explore forgiveness both as a divine attribute and as a human imperative, reflecting on its spiritual, moral, and historical dimensions.