The Solemnity of the Most Blessed Trinity Sunday is celebrated on Sunday after Pentecost to sum up the work of the Triune God – the Father bursting with love to the world sent us his son (the logos) to redeem fallen humanity through the paschal mystery (passion, death and resurrection) and the Holy Spirit (who proceeds from the Father and the Son) - the ultimate guide of the church that is both human and divine in its nature. The mystery of salvation is accomplished by the Father through the Son in the Holy Spirit. Nowadays, great emphasis has been placed on the individual roles and functions of the Trinity: God the Father created us, God the Son redeemed us, God the Holy Spirit sanctified us as stated in the Catechism. Entrance Antiphon praises God, “for he has shown that he loves us.” The Opening Prayer (Collect) says, "God our Father, who by sending into the world the word of truth and the Spirit of sanctification made known to the human race your wondrous mercy, grant us, we pray, that in professing the true faith, we may acknowledge the Trinity of eternal glory and adore your Unity, powerful in majesty."
We may not be aware of the historical unfolding of the Trinitarian doctrine of God but I am certain that whenever we pass by and/or enter our church or any church for that matter, start a prayer be it communal or individual, say grace before meals, leave the house, drive a car, hit slot machines, pray for miracle, intercede for a person in need, watch a nail- bitter game, we make the most ordinary yet powerful Catholic gesture of making the sign of the cross invoking the power of the Triune God as a humble act of faith, surrender and belongingness. We believe that whenever we do so, we express our profound belief in the Triune God.
There is no explicit mention of the Trinity in the Old Testament but there are traces in the New Testament. Over and above, the Most Holy Trinity is borne out of the love (agape as the deepest form) of God. Trinity is all about divine affection. It is the love that takes your breath away. Although in the early years of Christianity, theological discourse has always been centered on the Trinity, the Blessed Trinity is an encounter with a mystery and not simply a doctrine to be understood correctly nor a formula to be memorized. No matter how hard we try, our minds are too little and narrow to grasp the full magnitude of its reality. We know when we start to achieve some clarity, we must drop it down. No explanation is adequate.
We will not go over the intellectual hairsplitting of the technical terms such as being, person, substance, homoousius (one in being, now consubstantial – Nicene Creed), homoiousius (similar in being) which was the central and major point of discourse in the 4th and 5th centuries thereafter. Early Church Fathers used philosophical analysis with references and fruitful insights from sacred writings in such a way as to explain the relation. While it's true that citing the controversies surrounding the formal declaration would help -Arianism (Arian Heresy) and its modern versions, including Godless lifestyles that put salvation at stake, sharing the life and love of the trinity speaks more deeply to a congregation at this time of the year when plans for summer vacation have just set in, dry heat starting to hit 3- digits down here in Douglas, Arizonans heading out to any body of water or taking shed at cooler temperatures in spite of the pandemic, church attendance on slow recovery, and so is, plate collection. Whether we experience pain, grief and loss resulting in the ravages of Covid -19, Trinity Sunday is about the pure, undefiled, truthful, sincere, genuine, safe, comfortable, and consoling love of God freely given to us, frail and mortal beings.
I am endlessly amazed at the mysterious unfolding of the living and loving God who created the world and made wonders, whom Moses made sure his people remembered in a rhetorical fashion:
"Ask now of the days of old, before your time, ever since God created man upon the earth; ask from one end of the sky to the other: Did anything so great ever happen before? Was it ever heard of? Did a people ever hear the voice of God speaking from the midst of fire, as you did, and live? Or did any god venture to go and take a nation for himself from the midst of another nation, by testings, by signs and wonders, by war, with strong hand and outstretched arm, and by great terrors, all of which the lord your God, did for you in Egypt before your very eyes? (Deut. 4:32-34)". Moses then continued with a confession of Faith leading his audience to their vocation/calling: "This is why you must now know, and fix in your heart, that the Lord is God in the heavens above and on earth below, and that there is no other...(Deut. 4:39)". Moses summoned the people to examine their lives in relation to God which starts with the many and wondrous blessings God has done to them. What God bestowed on us remains to be our foundational belief. We faithfully and religiously come to Church because of the love of God. This is the God who revealed himself in the person of Jesus Christ and the Holy Spirit whom Matthew mentioned in the gospel with a promise, assurance and mission:
“All power in heaven and on earth has been given to me. Go, therefore, and make disciples of all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Spirit…And behold, I am with you always until the end of the age (Mt. 28:18-20).” This text towards the end of Matthew’s gospel tells us of the great commission by virtue of our baptism always in the name of the Trinity.
The alleluia verse too praises God, “Glory to the Father, the Son and the Holy Spirit: to God who is, who was, and who is to come.”
For further study, the ancient writings of   St. Athanasius’ Creed  and St. Augustine’s On the Trinity  (De Trinitate) are the best sources available so far. In my almost a decade of preaching, I’ve learned to be very careful with analogies especially about the Trinity as I think that metaphors if not explained well, create more confusion than clarity. In spite of the limits of human language and symbols, this is how we approach the partially hidden things of God. My God is too high, I can't go up to him. He is too low, I can't go down. He is too wide, I can't go around him. But the door is open and I can get in. He invites me to enter. Amen.
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May God bless you abundantly!
Bishop Edward J. Weisenburger