05/31/2026
WHY GOD IS A TRINITY
Holy Trinity Sunday often presents a challenge for both preachers and congregations. Many sermons become overly focused on explaining how God can be three Persons in one God, sometimes leaving listeners more confused than enlightened. A humorous story tells of a young priest who preached his first Trinity Sunday homily using all the theology he had learned in seminary. After listening to his complex explanation, an elderly woman remarked, “I always believed in the Trinity – until right now.” This story reminds us that the Trinity is not meant to be reduced to a difficult intellectual puzzle.
The doctrine of the Trinity is not primarily about solving a theological mystery but about understanding why God reveals Himself in this way. God does not seek to satisfy our curiosity about how He is Trinity; rather, He reveals why He is Trinity. The Scriptures of today point us toward this deeper meaning.
In the First Reading, God reveals Himself to Moses on Mount Sinai as compassionate, merciful, faithful, and forgiving. This covenant with Israel shows a God whose nature is love and mercy. In the Second Reading, St. Paul speaks of grace, love, and fellowship as gifts flowing from the Triune God. In the Gospel, Jesus proclaims the greatest sign of divine love: God sent His Son not to condemn the world but to save it. These readings reveal that the Trinity is God’s loving self-disclosure. God is Trinity because He is a loving God who delights in communion and relationship.
As we can see in these three readings, God's true character is love. Though God acts through three distinct Persons, the Father, the Son, and the Holy Spirit share one and the same divine Substance and one Divinity. Because the Persons live in perfect communion and total self giving, whatever belongs to one Person is fully shared by the others (cf. Jn 16:14–15). From all eternity, the Father loves the Son, and the Son receives, and returns that love, and the Holy Spirit is the living bond of that love. This illustrates the key message: God is a Trinity because God is eternal love: love that is shared, given, received, and poured out.
As Love that is shared, God teaches us that He is a “Relationship”. We learn from God that love is giving, and great love is giving greatly. In this way, the Father tells us He is a God who cherishes communion, who wants to be reached and to reach others. In doing so, He reveals that love is the secret to every good relationship.
If God is a communion of love, then we who are made in His image are created for relationship, community, forgiveness, and self-giving love. We are not made for isolation or for self-protection. We are made to reflect the life of the Trinity. The gifts, blessings, and graces we have are meant to be shared with one another. Thus, the doctrine of the Trinity is not an abstract idea reserved for theologians, but a statement about us - an invitation to share in God’s own life and to build a community of love modeled on the very life of God Himself. With this foundation, we can see how our calling is rooted in God's own character
As we leave this Mass today, we are invited to live the Mystery and not just try to explain it. The Good News is this: only a God who is love, relationship, and communion can save the world. So rather than exhausting ourselves trying to reason our way through the Trinity, we would do far better to let the Trinity shape how we love, guide how we forgive, inspire how we serve, strengthen our relationships, and let the Trinity remind us of our dignity as children of the Father, redeemed by the Son, filled with the Holy Spirit.
So, the Trinity is not just a concept to understand, but a life to live, a relationship to embrace, and a love to imitate. Instead of leaving this mystery in our minds, let it transform our hearts and direct how we love, forgive, serve, and live as children of the God who is Father, Son, and Holy Spirit. Amen.