In the Name of God the Father, God the Son and God the Holy Ghost. Amen.
There, I just invoked the mystery of the God of Jesus Christ, the Holy and Undivided Trinity. Having completed the half of the Church Year dedicated to Jesus’ incarnation, ministry, death and resurrection — from Advent to Pentecost – we celebrate the mystery of Almighty God on Trinity Sunday.
Look up just over the high altar, in the center of the tableau just over the altar cross. There you see the risen Jesus, revealing his resurrection to Saint Thomas, who is on his knees, his arms outstretched, obviously crying out – as Saint John reports – “My Lord and my God.”
That confession, which is a high point in the gospels, was foreshadowed earlier at many points in Jesus’ ministry – as when Peter confessed Jesus to be the Christ, the Son of the living God, or when Jesus worked his messianic miracles, or forgave sins, or taught with authority, interpreting the Law and declaring the Son of man to be Lord of the Sabbath, or calling God, as he did constantly, his own Father.
“My Lord and my God,” summarizes it all, and it shows us the source of the doctrine of the Holy and Undivided Trinity.
The Trinity is the revelation of the God of Jesus Christ. Jesus’ whole ministry impressed it upon the Church, including his teaching about the Father and the Holy Spirit and his unique relation to each of them as the eternal Son.
The early Christians began to see the Trinity in the Old Testament Scriptures. For example, in the creation story in Genesis, they saw the creative work of the Lord God as triune, three-in-one, and one-in-three. God spoke his Word and ordered the world. God breathed his Spirit and quickened the life of the cosmos. God – Word – Spirit = Father –Son – Holy Ghost.
Those early Christians also saw a shadow of the Trinity in the visitation of Abraham and Sarah by the three angelic beings. They heard the praise of the Trinity in the vision of the prophet of Isaiah, who heard the angelic cherubim sing “Holy, Holy, Holy is the Lord of hosts.”
The early Christians saw the image of the Trinity in the soul of man, the triune faculties of memory, reason and will. They saw the analogy of the Trinity in physical nature, as in the primal element of water in the three forms of liquid, vapor and ice; or, as Saint Patrick pointed out to his simple hearers, in the triune shape of the shamrock.
All the great moments of Christian life are marked by the Holy Trinity. The Sacraments are works and signs of the Holy Trinity.
We were baptized into the life of the God of Jesus Christ by having water poured on us in the name of the Father and of the Son and of the Holy Ghost.
When we use the Sacrament of Penance, there on our knees, we hear the words of absolution from the priest, “I absolve thee, in the Name of the Father and of the Son and of the Holy Ghost.”
A husband and wife receive the marriage blessing: “God the Father, God the Son, God the Holy Ghost, bless, preserve and keep you…that ye may so live together in the life, that in the world to come you may have life everlasting.”
A priest is ordained as the Bishop lays on his hands and prays, “Therefore, Father, though Jesus Christ your Son, send your Holy Spirit…and make him a priest in your Church…”
If you are sick and receive the laying on of hands and anointing, again, it is in that triune name of the Father, the Son and the Holy Spirit.
Finally, when you are dying, the last rites of the Church say, “Depart, O Christian Soul, out of this world, in the Name of God the Father Almighty who created you, in the Name of Jesus Christ our Lord who redeemed you, in the Name of the Holy Spirit who sanctifies you; may your rest be this day in peace, and your dwelling place in the paradise of God.”
What the Holy and Undivided Trinity means is this: God is love.
The revelation by Jesus that God is a Trinity of Persons means that from all eternity the Father gives everything to the Son, and the Son, in response, returns that love so completely that the Love Itself is co-equal with them and proceeds from them, the Holy Spirit. This is the Holy and Undivided Trinity. He is an overflowing fountain of love and grace.
This love of God may be seen in creation, and it may be seen in redemption. The most specific image we have is of Christ on his cross. There the Holy Spirit teaches our hearts and minds that Jesus truly is the Son of God and incarnates the love of the Father: God so loved the world that he gave his only Son.
So the Holy and Undivided Trinity is the God of Jesus. He is our very life, in whom we live and move and have our being. Now, in this Eucharist, we make this mystery visible. How is that?
We give thanks to the Father for creation and even more for redemption through Christ his Son. We ask that by the power of the Holy Spirit, the Word of the Son will cleanse, wash and transform us in our inmost being, body and soul, just as he changes the bread and wine, into his life-giving Body and Blood, that he may dwell in us and we in him. So in this Sacrament of all sacraments, by the grace of God we are drawn again into the Trinity, to the very heart, where, the cross of Christ is re-presented, and we are fed by the Body of Christ, of which we are made living members.
In the Name of God the Father, God the Son and God the Holy Ghost. Amen.

