Adoration of the Trinity,
Vicente López Portaña, 1792

Readings
Deuteronomy 4:32-34, 39-40
Psalm 33:4- 6, 9, 18-20, 22
Romans 8:14-17
Matthew 28:16-20

Last Sunday, we celebrated the sending of the Spirit, which sealed God’s new covenant and made a new creation.

In this new creation, we live in the family of God, who has revealed himself as a Trinity of love. We share in His divine nature through His body and blood (see 2 Peter 1:4).

This is the meaning of the three feasts that cap the Easter season—Pentecost, Trinity Sunday, and Corpus Christi.

These feasts should be intimate reminders of how deeply God loves us, how He chose us, from before the foundation of the world, to be His children (see Ephesians 1:4-5).

Today’s readings illuminate how all God’s words and works were meant to prepare for the revelation of the Trinity and God’s blessing in Jesus Christ—the blessing we inherited in baptism, and renew in each Eucharist.

By God’s word the heavens and earth were filled with His kindness, we sing in today’s Psalm. Out of love, God called Abraham and chose his descendants to be His own people, Moses says in today’s First Reading (see Deuteronomy 4:20,37). Through the Israelites, He revealed to the nations that He alone is Lord and there is no other.

In Jesus, God’s word took flesh as a son of Abraham (see Matthew 1:1). And Jesus reveals in the Gospel today that the one God is Father, Son, and Spirit, and that He desires to make all peoples His own.

As He led Israel out of Egypt, God freed us from slavery, Paul says in today’s Epistle. As He adopted Israel (see Romans 9:4), He gives us the Spirit by which we can know Him as “our Father.”

As God’s heirs, we receive the commissions of Moses and Jesus today. We are to fix our hearts on Him, and to observe all that He has commanded. The Eucharist is His pledge—that He will be with us until the end, that He will deliver us from death to live forever in the promised land of His kingdom.

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Saint Irenaeus of Lyons (c.130–c.208)
from Demonstration of the Apostolic Preaching, 6–7

This is the order of our faith, the foundation of the edifice and the support of our conduct: God, the Father, uncreated, uncontainable, invisible, one God, the Creator of all: this is the first article of our faith. And the second article: the Word of God, the Son of God, Christ Jesus our Lord, who was revealed by the prophets according to the character of their prophecy and according to the nature of the economies of the Father, by whom all things were made, and who, in the last times, to recapitulate all things,' became a man amongst men, visible and palpable, in order to abolish death, to demonstrate life, and to effect communion between God and man. And the third article: the Holy Spirit, through whom the prophets prophesied and the patriarchs learnt the things of God and the righteous were led in the path of righteousness, and who, in the last times, was poured out in a new fashion upon the human race renewing man, throughout the world, to God.

For this reason the baptism of our regeneration takes place through these three articles, granting us regeneration unto God the Father through His Son by the Holy Spirit: for those who bear the Spirit of God are led to the Word, that is to the Son, while the Son presents them to the Father, and the Father furnishes incorruptibility. Thus, without the Spirit it is not possible to see the Word of God, and without the Son one is not able to approach the Father; for the knowledge of the Father is the Son, and knowledge of the Son of God is through the Holy Spirit, while the Spirit, according to the good-pleasure of the Father, the Son administers, to whom the Father wills and as He wills.

Pope Benedict XVI
from Angelus Address, June 7, 2009

After the Easter Season which culminated in the Feast of Pentecost, the liturgy provides for these three Solemnities of the Lord: today, Trinity Sunday; next Thursday, Corpus Christi which in many countries, including Italy, will be celebrated next Sunday; and finally, on the following Friday, the Feast of the Sacred Heart of Jesus. Each one of these liturgical events highlights a perspective by which the whole mystery of the Christian faith is embraced: and that is, respectively the reality of the Triune God, the Sacrament of the Eucharist and the divine and human centre of the Person of Christ. These are truly aspects of the one mystery of salvation which, in a certain sense, sum up the whole itinerary of the revelation of Jesus, from his Incarnation to his death and Resurrection and, finally, to his Ascension and the gift of the Holy Spirit.

Today we contemplate the Most Holy Trinity as Jesus introduced us to it. He revealed to us that God is love "not in the oneness of a single Person, but in the Trinity of one substance" (Preface). He is the Creator and merciful Father; he is the Only-Begotten Son, eternal Wisdom incarnate, who died and rose for us; he is the Holy Spirit who moves all things, cosmos and history, toward their final, full recapitulation.

Three Persons who are one God because the Father is love, the Son is love, the Spirit is love. God is wholly and only love, the purest, infinite and eternal love. He does not live in splendid solitude but rather is an inexhaustible source of life that is ceaselessly given and communicated. To a certain extent we can perceive this by observing both the macro-universe: our earth, the planets, the stars, the galaxies; and the micro-universe: cells, atoms, elementary particles. The "name" of the Blessed Trinity is, in a certain sense, imprinted upon all things because all that exists, down to the last particle, is in relation; in this way we catch a glimpse of God as relationship and ultimately, Creator Love.

All things derive from love, aspire to love and move impelled by love, though naturally with varying degrees of awareness and freedom. "O Lord, our Lord, how majestic is your name in all the earth!" (Ps 8: 1) the Psalmist exclaims. In speaking of the "name", the Bible refers to God himself, his truest identity. It is an identity that shines upon the whole of Creation, in which all beings for the very fact that they exist and because of the "fabric" of which they are made point to a transcendent Principle, to eternal and infinite Life which is given, in a word, to Love."

In him we live and move and have our being", St Paul said at the Areopagus of Athens (Acts 17: 28). The strongest proof that we are made in the image of the Trinity is this: love alone makes us happy because we live in a relationship, and we live to love and to be loved. Borrowing an analogy from biology, we could say that imprinted upon his "genome", the human being bears a profound mark of the Trinity, of God as Love.