HOMILY OF THE MOST HOLY TRINITY — YEAR A
HOMILY OF THE MOST HOLY TRINITY — YEAR A
HOMILY THEME: THE TRINITY AT THE HEART OF CHRISTIAN FAITH
BY: Fr. Anthony O. Ezeaputa, MA.
Ex 34: 4 – 9, 2 Cor 13: 11 – 13, Jn 3: 16 – 18
The doctrine of the Most Holy Trinity is the most fundamental and essential teaching in the “hierarchy of the truths of faith” (Catechism of the Catholic Church [CCC] 234). The hierarchy of truths means that while all revealed doctrines of the Catholic faith are true and worthy of belief, some truths are more central because they are more directly connected to the foundation of Christian revelation and salvation. The Trinity stands at the center because it reveals who God is in Himself: Father, Son, and Holy Spirit. This belief in one God—the Creator, the Redeemer, and the Sanctifier—is the foundation of the whole Christian faith, and all other truths of faith are built upon it, flow from it, and are illuminated by it (CCC 234; Unitatis Redintegratio, 11).
This is why we are baptized “in the name of the Father, and of the Son, and of the Holy Spirit” (Matthew 28:19). Therefore, Baptism incorporates us into the life of the Trinity and makes us members of the Church of Christ. Consequently, one cannot properly profess the Christian faith while rejecting the Trinity—to deny the Triune God is to deny the very God revealed by Jesus Christ. As the Catechism teaches, “The mystery of the Most Holy Trinity is the central mystery of Christian faith and life. It is the mystery of God in himself” (CCC 234).
All Christian prayer, liturgy, and ecclesial life flow from and return to the Father, through the Son, in the unity of the Holy Spirit. This reflects what Saint Thomas Aquinas describes as the exitus-reditus (going forth and return) pattern of all creation and salvation. According to Saint Thomas, all things come forth (exitus) from God as their origin and are called to return (reditus) to God as their end.
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Although all the external works of the Trinity are the common action of the Father, Son, and Holy Spirit, the Church traditionally appropriates creation to the Father, redemption to the Son, and sanctification to the Holy Spirit. Thus, creation comes from the Father through the Son in the Holy Spirit, and through Christ, in the power of the Holy Spirit, all creation is led back to the Father. The whole Christian life is therefore a journey from God and back to Him.
This Trinitarian movement is especially visible in the liturgy and sacramental life of the Church. In the Holy Sacrifice of the Mass, worship ascends to the Father, through the Son, in the unity of the Holy Spirit. Likewise, the grace of salvation descends from the Father, through the Son, in the Holy Spirit to sanctify the faithful. Therefore, the entire plan of salvation bears a profoundly Trinitarian structure: from the Father, through the Son, in the Holy Spirit—and back to the Father, through the Son, in the Holy Spirit. As the Catechism teaches, “The ultimate end of the whole divine economy is the entry of God’s creatures into the perfect unity of the Blessed Trinity” (CCC 260). Thus, Christian existence is not merely about belonging to a religion; it is participation in the eternal life, love, and communion of the Triune God.
Traces of the Trinity in Creation and Salvation History
God has left traces of this profound mystery both in creation and throughout salvation history. The created world reflects, in a limited way, the wisdom, beauty, order, and relational nature of its Creator (Romans 1:20). Sacred Scripture likewise gradually reveals the mystery of the Triune God through the missions of the Son and the Holy Spirit in the history of salvation. The Father sends the Son for the redemption of the world (John 3:16), and together the Father and the Son send the Holy Spirit to sanctify and guide the Church (John 14:26; 15:26). Yet, despite these revelations, the inner essence of God, that is, who God is in Himself, infinitely transcends human understanding. As the Church teaches, “God’s inmost Being as Holy Trinity is a mystery that is inaccessible to reason alone” (CCC 237).
The Trinity Revealed at the Baptism of Jesus
One of the clearest manifestations of the Trinity in Sacred Scripture occurs at the Baptism of Jesus in the Jordan River (Matthew 3:16–17). As Jesus, the Son, emerges from the water, the Holy Spirit descends upon Him in the form of a dove, while the voice of the Father is heard from heaven saying, “This is my beloved Son, with whom I am well pleased.” In this event, the three divine Persons are revealed simultaneously: the Father speaks, the Son is baptized, and the Holy Spirit descends. The Church has always recognized this event as a powerful revelation of the mystery of the Triune God. While the fullness of Trinitarian doctrine would be more clearly understood after the Resurrection and Pentecost, the Baptism of Jesus offers a profound glimpse into the communion of Father, Son, and Holy Spirit.
The Mystery of God Beyond Human Understanding
The mystery of the Blessed Trinity is, in the strictest sense, a mystery of faith. The First Vatican Council teaches that there are divine mysteries “hidden in God” which can never be fully known unless revealed by Him and which, even after revelation, remain beyond the complete grasp of human reason (Dei Filius, chap. 4). The Trinity is not contrary to reason; rather, it surpasses the full limits of human reason. Consequently, throughout history, there has been a perennial human temptation to box and label God, shrink the divine mystery to manageable proportions, and confine God to human logic and imagination. Yet every attempt to fully contain God ultimately fails because the infinite God always exceeds finite human comprehension.
As Saint Augustine of Hippo famously observed while reflecting on the Trinity: “If you comprehend it, it is not God” (Si comprehendis, non est Deus). If we believe we understand the essence of God, then whatever we believe we have understood is something other than God. God infinitely surpasses all human understanding. Moreover, spiritual maturity begins when we humbly recognize this truth—God is beyond our human understanding.
Divine Mercy and the Mystery of the Trinity
The mystery of the Blessed Trinity is not merely a truth about God’s inner life; it also helps us understand how God acts toward us. Because God is eternal communion and eternal love, His justice is never separated from His mercy. The Father eternally loves the Son, the Son eternally loves the Father, and this mutual love is expressed in the Holy Spirit. Consequently, God always acts according to the wisdom of divine love rather than the limitations of human judgment.
This mystery becomes especially evident in the way God deals with sinners and human weakness. We are often tempted to point out to God those whom we consider evil, unjust, or undeserving of mercy. We often demand that He deal with them according to our standards of judgment. Yet God does not see as we see. His wisdom, mercy, and justice infinitely transcend our limited human perspective. As the Lord declares through the prophet Isaiah, “For my thoughts are not your thoughts, nor are your ways my ways” (Isaiah 55:8–9).
One of the mysteries of God’s justice is that He continues to love even sinners and desires not their destruction but their conversion. Sacred Scripture repeatedly reveals that God “does not desire the death of the wicked, but that the wicked turn from his way and live” (Ezekiel 33:11). Similarly, Saint Peter teaches that God is “patient toward you, not wishing that any should perish, but that all should reach repentance” (2 Peter 3:9). From a purely human standpoint, such mercy can be difficult to understand. We often prefer justice without mercy, while God reveals justice perfected through mercy.
Therefore, theology is not merely an intellectual exercise aimed at mastering divine concepts. Instead, authentic theology must lead us to humility, worship, wonder, repentance, and adoration before the living God whose wisdom surpasses all human understanding. The more we encounter God’s mystery, the more we must realize that true wisdom begins in humility before the Blessed Trinity’s infinite majesty.
One Divine Nature in Three Persons
We believe that God is eternally one divine Being in three distinct Persons: Father, Son, and Holy Spirit. This truth did not begin with the Incarnation of the Son in the womb of the Blessed Virgin Mary or with the sending of the Holy Spirit at Pentecost. Rather, God has always existed eternally as the Trinity. Long before the Word became flesh (John 1:14), the Son already existed eternally with the Father, and the Holy Spirit eternally proceeded from the Father and the Son.
Tertullian was among the first theologians to express this mystery using the classic formula una substantia, tres personae—“one substance in three Persons.” In other words, God is one in essence or nature, yet three in Person. Centuries later, Karl Rahner explained that the God revealed to us in salvation history is truly the same God who eternally exists as Father, Son, and Holy Spirit. He summarized this insight with the famous statement: “The Economic Trinity is the Immanent Trinity and the Immanent Trinity is the Economic Trinity.”
Understanding Nature and Person
But what does it actually mean to say that God is “one Being in three Persons”? The first step toward understanding this mystery is to distinguish between the concepts of nature and person. Nature answers the question, “What is it?” while person answers the question, “Who is it?”
Every human being possesses one human nature, yet each human person is distinct. In God, however, there is only one divine nature—one divine intellect, one divine will, and one divine essence—but this one divine nature exists eternally in three distinct divine Persons: the Father, the Son, and the Holy Spirit. The Father, Son, and Holy Spirit are distinct Persons. Yet each Person is fully and equally God, possessing the same undivided divine nature.
As the Church teaches, “The divine persons do not share the one divinity among themselves, but each of them is God whole and entire” (CCC 253). This mystery surpasses human reason, yet it does not contradict reason. Rather, it invites believers into deeper contemplation, worship, and communion with the living God who has revealed Himself as eternal love.
The Trinity and Christian Community
The mystery of the Trinity also reveals something important about the human person. Because we are created in the image and likeness of God (Genesis 1:26–27), and because God Himself is an eternal communion of Persons, we are created for communion, relationship, and love. Human beings are not meant to live in isolation, selfishness, or division. Every family, marriage, friendship, parish community, and act of genuine charity reflects, however imperfectly, the communion that exists eternally within the Blessed Trinity.
This truth challenges the spirit of individualism that often characterizes modern society. The more we grow in love, forgiveness, unity, self-sacrifice, and concern for others, the more our lives reflect the image of the Triune God. Conversely, hatred, division, selfishness, and refusal to forgive distort the divine image within us. The mystery of the Trinity therefore calls us not only to believe rightly about God but also to live in a way that reflects His communion of love.
Living the Trinitarian Life
Today, let us humbly acknowledge that God is a mystery infinitely greater than anything we can imagine, explain, or fully comprehend. No human mind can completely grasp the fullness of the living God, for “his greatness is unsearchable” (Psalm 145:3). The mystery of God always surpasses human language, concepts, and categories. Therefore, authentic faith begins not with reducing God to the limits of human understanding but with reverence, humility, and trust before the divine mystery.
Rather than reshaping God according to our preferences, ideologies, or expectations, we must allow Him to be God. The Christian life is not fundamentally about controlling or fully explaining God but about surrendering ourselves to His truth, love, and will.
Consequently, our calling is to walk in humble obedience to the Holy Spirit, who leads us into communion with the Triune God. Saint Paul teaches, “For all who are led by the Spirit of God are children of God” (Romans 8:14). To follow the Holy Spirit means allowing God—not our ego, pride, anger, or limited understanding—to direct and shape our lives. It means trusting God even when we do not fully understand His ways. Ultimately, the mystery of the Blessed Trinity is not merely a doctrine to be studied intellectually but a divine life into which we are invited through faith, worship, holiness, and love.
A Trinitarian Doxology
May our lives continually glorify the Father, who in His infinite love and almighty power created us in His own image and likeness (Genesis 1:26–27), calling us into existence not out of necessity but out of love. May our lives glorify the Son, our Lord Jesus Christ, who by His Passion, Death, and Resurrection redeemed us from sin and eternal death. Through His Precious Blood, “we have redemption, the forgiveness of sins” (Ephesians 1:7), and through Him the gates of heaven have been opened to those who believe (John 14:6). May our lives glorify the Holy Spirit, the Lord and Giver of Life, who sanctifies us through Baptism and continually pours divine grace into our hearts, conforming us ever more fully to Christ (Romans 5:5; Titus 3:5).
Indeed, the whole Christian life is Trinitarian. We are created by the Father, redeemed through the Son, and sanctified in the Holy Spirit. Every prayer, sacrament, grace, and act of salvation flow from the Father, through the Son, in the unity of the Holy Spirit. The Trinity is not merely a doctrine to be believed but the very life into which Christians are baptized and called to participate. Therefore, to the Father, and to the Son, and to the Holy Spirit—one God in three divine Persons—be all glory, honor, worship, and adoration forever and ever. Amen.
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