Eight hundred years after his birth, St. Thomas Aquinas remains a towering figure in Christian thought. His analysis of the Atonement—the reconciliation between God and humanity effectuated by Christ—is a cornerstone of systematic theology. In his keynote address for the “Aquinas at 800” Conference at the University of Notre Dame, Father Thomas Joseph White, Rector Magnificus of the Angelicum, illuminated the depth and enduring relevance of the Thomistic perspective, revealing a vision of the Cross that is rich with meaning, mercy, and glory.
Introduction: A Deeper Meaning for the Cross
Father White began by framing the lecture’s central thesis: for St. Thomas Aquinas, the Crucifixion is not simply an event of suffering or a payment for sin. It is, first and foremost, the ultimate epiphany of God’s nature. The atoning act of the Cross is an act of reconciliation animated by divine charity and wisdom. In this single event, both the perfection of Christ’s human nature and the power of his divine nature are made manifest. Far from being a moment of shame, the Cross is, even before the Resurrection, a profound manifestation of divine and human glory.
Atonement as Reconciliation and Perfection
Delving into Aquinas’s complex understanding of atonement (a word derived from the early modern English “at-one-ment”), Father White explained that the concept extends far beyond a simple “satisfaction” for sin. For Aquinas, the Incarnation and Atonement serve a twofold purpose: the divinization and moral perfection of humanity, and the remedy for the evil of sin. God became human to offer humanity a share in the divine life of the Trinity and to provide a perfect example of human virtue.
Father White drew a crucial distinction between Aquinas and his predecessor, St. Anselm. While Anselm argued from a position of qualified necessity—that if God were to save humanity, it must be through a God-man whose actions had infinite value—Aquinas emphasizes divine fittingness and mercy. God, in His sovereignty, could have forgiven sins by a simple decree. However, Aquinas argues it was “most fitting” that God became human to effect redemption in a way that was supremely merciful as well as just. The gift of justice in Christ is embedded within, and most expressive of, God’s even more profound and intensive mercy.
The Revelation of Two Natures
The Cross, in Aquinas’s view, serves as the ultimate stage for revealing the reality of Christ’s two natures. The perfection of his human nature is displayed in his sinless obedience and charity. His decision to suffer innocently is the highest expression of his love for God the Father and for all humanity. This act of perfect human virtue, freely offered, becomes a source of grace for the entire human race.
Simultaneously, the power of his divine nature is shown in the fact that the entire Trinity is actively present and working for humanity’s salvation through the Crucifixion. The human act of Christ is an instrument of the divine. As Father White vividly described, the divine love in Christ is like an “uncreated fire burning in the atonement but reflected in similitude in the creative fire of the human heart of Jesus.” God the Father, Son, and Holy Spirit are not passive observers but the principal agents of redemption, making the Cross a true epiphany of God’s Trinitarian life and providential design.
The Hidden Glory of the Crucifixion
Perhaps the most counterintuitive and profound insight of the lecture was the analysis of the Cross as a moment of glory. Father White explained that Aquinas often employs a pithy definition attributed to St. Ambrose: glory is the “splendor of nature that is known and praised.” While we intuitively associate Christ’s glory with the Resurrection, Aquinas identifies four senses in which the Cross itself is glorious. First is the glory of the act itself: the splendor of Christ’s redemptive charity, which definitively conquers evil. Second is the fruit of this glory: God the Father is glorified as His wisdom and power are revealed to humanity. Third is the author of this glory: the Trinity itself, whose glory is shared with the world. Finally, there is the time of glory: the Cross is Christ’s “hour,” the very doorway through which He enters into his final glorification and prepares a new future for humanity.
This Thomistic vision reframes the Passion not as an event of isolated suffering, but as an integral part of a unified, glorious act of divine love that finds its culmination in the Resurrection.
