Deuteronomy 4:32 – 34, 39 – 40
Psalm: 33
Romans 8. 14 – 17
Gospel: Matthew 28: 16 – 20

Today we celebrate Holy Trinity Sunday. It is a day when we focus on the most fundamental teaching of the Christian faith, namely, that there is only One God and that God is a Trinity of Persons, God – Father, Son, and Holy Spirit. The Trinity is not myth, a riddle, or an insoluble mathematical puzzle. We know of the mystery of the Trinity only because God has granted us, so to speak, a window into his inner life. Even so, we could never pretend to grasp this mystery in its fullness. After writing a brilliant treatise on the Trinity, St. Augustine concluded it by saying: “Among the many things I have said, I am sure and I declare that I have said nothing that is worthy of this supreme, ineffable Trinity” (On the Trinity, I; XV). Augustine’s words are an admonition to every Trinity Sunday homilist, including me. Let me just say that, with all my heart, I believe in the Most Holy Trinity. I have staked my life and pinned my hopes on the living and true God, the One God in Three Persons. It is my fervent prayer that, in God’s grace, you can make the same profession of faith.
By professing our faith in a God who exceeds everything we could imagine, we resist the temptation to create for ourselves a god designed to meet our needs, a god who is a mere projection of our desires for a better life and a better world. This Solemnity of the Most Holy Trinity is preeminently that day when we, fallible and sinful creatures of flesh and blood . . . let God be God . . . when, despite the dimness of our vision, we bow before the God who made us: “For he is [indeed] our God and we are his people, the flock he shepherds” (Ps. 95:7). Entrusting ourselves to God, let us find in the depths of the Most Holy Trinity, how we are to reorient our lives, especially in this time of upheaval, including our personal lives, the life of our Church, and the life of society. In a time of bitter division, let us seek unity in the oneness of God’s inner life. In a time when the hostility of racism is again laid bare, let us learn respect and love in the distinctness and relatedness of the Three Persons of the Trinity.
The Unity of God’s Inner Life: So, as we peer by faith into the unity of God’s inner life, let us be amazed and grateful. For the inward life of God is “an eternal exchange of love the Father, the Son, and the Holy Spirit” (CCC № 221); in a word “God is love” (1 Jn. 4:16). The Father is the lover; the Son is the beloved; the Holy Spirit is their bond of love. Each person fully shares the divine nature – and how beautiful it is that the God of glory and majesty, the God of power and might, is a unity of love. In freely deciding to create us and redeem us, God, a Trinity of Persons, acted in complete and total unity of purpose. With overflowing love and mercy, God wanted to share his inner life and love with us.

Let us think of it: God the Father gave us everything he had – his only Son – because he did not want us to perish in our sins; because he wanted to save us. God sent us the Holy Spirit so that the redeeming love of Jesus would take root in us, transform our lives, change us from the inside out, and unite us as witnesses of his saving truth and love. How often Jesus spoke of his intense unity with his heavenly Father and he manifested that unity, by spending countless nights in prayer; by preaching the Word of the Father; by doing the works of God, that is, his miracles; and ultimately, by laying down his life for us in obedience to his Father’s saving will. Risen from the dead, the Lord Jesus promised to send the Holy Spirit upon us so that we might share in his exchange of love with the heavenly Father. In a word, the Trinity of Persons call us to share in their intense unity of love and to be messengers and instruments of that unity in the world today.
What good news for a world that finds itself bitterly divided! And divided we are by wealth and poverty; and by access to educational opportunity and health care, and lack thereof. We are alienated from one another by ideologies and by a raging war of words. The God who is an everlasting exchange of love, utterly united in self-giving love, calls on you and me to be ambassadors in the midst of a world torn asunder: ambassadors of truth, love and unity; ministers of justice, peace, and charity; disciples who are not only hearers of God’s Word but also doers of his Word. What’s more, the One God in Three Persons calls on the Church to model for society how to believe, pray, live, and work together in a unity mind and heart that reflects his own Triune life. This is why the II Vatican Council challenged the Church to manifest itself as ‘a people called into unity from the unity of the Father, the Son, & the Holy Spirit’ (LG, 4). So, it turns out that Trinity Sunday is not an exercise in dry speculation about God, but rather an urgent summons from the One God in Three Persons to “mend [our] ways, encourage one another, agree with one another, & live in peace…” Thus will the God of love and peace dwell within us and among us! [cf. 2 Cor. 13:11). Make us, Lord, instruments of your unity and peace, both in the Church and society.
The Distinctness and Relatedness of the Persons of the Trinity: Let us now spend a moment, dear friends, prayerfully considering the distinctness and relatedness of the Persons of the Most Blessed Trinity… The one and only God is Father, Son, and Holy Spirit. God the Father is not God the Son but begets the Son from all eternity. God the Son is not God the Father but is eternally begotten by the Father. God the Holy Spirit is neither the Father nor the Son but is the reciprocal bond of love between them. Now, that may indeed sound very dry and abstract, but it is not. The point is that the Persons of the Trinity are indeed distinct but related. The Father and the Son are not the same yet they share in a fellowship of love, a fellowship of love so real that is the Person of the Holy Spirit (cf. 2 Cor. 13:13).

The distinctness and relatedness of the Persons of the Trinity are also in fact an urgent summons from the heart of God to love and respect as equals those whose skin color, language, nationality, politics, and culture differ from our own. The One God who is a Trinity of Persons calls us to renounce the sin and heresy of racism in all its forms, and with God’s grace, to eliminate it from our hearts, our homes, our Church, our society, and our systems. We are summoned again today to recognize and respect our differences while relating to one another as brothers and sisters, as friends, and as families, who stand with one another in a solidarity of human dignity. Far too often, we have failed to heed this summons and those failures can be heard in the protests that now echo on our streets.
The Holy Trinity, whose feast we celebrate today, is beyond the reach of time and the grasp of human reasoning. It is a mystery of our faith. We can only fumble in the dark in search of glimmers of light. “Two is company, three is a crowd” is a popular expression. The gospel would have it otherwise. There, the figure three symbolises completeness and perfect symmetry, and re-appears at all the key moments of the Christ story. His life itself constantly reflected the Trinity. Three figures make up the nativity scene in Bethlehem — the Holy Family of Jesus, Mary and Joseph. Their first visitors were the three wise men. Later, in the desert preparing to begin his public life, Jesus was tempted three times by the devil. A good story should have a beginning, a middle and an end. Christ was a storyteller par excellence and three figures prominently in his parables. The Prodigal Son is about a father and his two sons; the Good Samaritan tells of the behaviour of three passers-by, the priest, the Levite and the Samaritan; the Sower sowed his seed in three different types of terrain, yielding three different levels of harvest. The end of his life, as the beginning, has again the three motif. During his Passion, Peter denied him thrice. On the road to Calvary, he fell three times. The crucifixion scene has three figures, Christ between two thieves. Before his resurrection, he spent three days in the tomb.
God is love. There are Three Persons in the Trinity, the Father the Son and the Holy Spirit. Together they represent the fullness of love. The Father loves the Son, the Son loves the Father. The Holy Spirit is their love for each other. We are made in the image of a triune God. God the Father, who created us, his Son who saved us, and the Holy Spirit who continues to guide us. Our lives should reflect the Trinity. We should be always creative like the Father, compassionate like his Son, and dispose our talents in the service of others like the Holy Spirit.
May “the grace of the Lord Jesus Christ, the love of God, and the fellowship of the Holy Spirit be with all of you” (2 Cor. 13:13).
God bless.