The Theology of the Trinity

Friends, on this Sixteenth Sunday of Ordinary Time, our Gospel is the Martha and Mary story, and in my years of preaching, I’ve found that it tends to bother people a lot. With the first reading about Abraham in mind, we can better understand what this passage means—and doesn’t mean. Rather than playing one sister off the other, we should read Martha and Mary together: When we focus on the “unum necessarium,” the one thing necessary, all the many things that preoccupy us find their proper place. 

Friends, in our first reading from the book of Deuteronomy this week, Moses says to the people, “For this command that I enjoin on you today is not too mysterious and remote for you. . . . No, it is something very near to you, already in your mouths and in your hearts; you have only to carry it out.” This is a master text for what we call in the Catholic tradition “the natural law.” It means that there is within us a kind of deep moral intuition by which we know the right thing to do; there are intuitions of value that give us a sense of meaning, purpose, and direction in life.

Friends, as we resume Ordinary Time, it’s appropriate that we’re looking at a portrait of the Church, because we’re coming back, if you want, to the ordinary work of the Church up and down the ages to the present day. Our Gospel from the tenth chapter of Luke gives us our marching orders—from going on mission together and staying rooted in prayer, to trusting in providence and supporting the work of the Church, to curing the sick and proclaiming the kingdom of God.

Friends, this year, the feast of Saints Peter and Paul falls on a Sunday, and I want to spend some time reflecting especially on Saint Peter. Around the year 64, Shimon Bar Yonah, a fisherman from Galilee, was put to death brutally in the Circus of Nero. But while the Roman Empire is long gone and the successor of Nero doesn’t exist, the empire of this fisherman, Peter the Apostle, is everywhere, and in May, his 266th successor walked out onto the loggia of Saint Peter’s Basilica, built over the very spot where he was buried. 

Friends, every year we have Trinity Sunday followed by today’s wonderful Solemnity of Corpus Christi—two of the highest theological mysteries of our faith, the Trinity and the Eucharist, back to back. As we reflect today on the Body and Blood of Jesus, I want to explore the deep connection between temple sacrifice, the altar of the cross, and the Mass.

Friends, today is Trinity Sunday—one of my favorite feast days of the year because I can put my old theologian’s cap on. Looking first at one of the greatest of the medieval theologians, Saint Bonaventure, and then at maybe the greatest figure in Western theology, Saint Augustine, I’d like to reflect with you on the dynamics of the Trinitarian life—the very matrix into which we’re inserted through baptism.

Friends, this is the great feast of Pentecost, the feast of the Holy Spirit. In the First Reading, the Spirit manifests himself as a strong driving wind, and while you can’t see the wind directly, you can see its effects. The text I want to reflect on today is not in the readings but is one of my favorites: Galatians 5:22–26, when St. Paul talks about “the fruit of the Spirit.” And it’s precisely to this same point: What are the signs that the Holy Spirit is operative in us?

Friends, getting the Ascension of the Lord right is very important for understanding many aspects of the Church’s life. So I want to dwell on that a little bit with you today, and I want to do so under two headings: the first I’m going to call more political, and the second more liturgical. They are both hinted at in the great statement in the Creed that we recite week after week: “He ascended into heaven and is seated at the right hand of the Father.”

Friends, we come to the Sixth Sunday of Easter, and as the Church readies us for Pentecost, the readings begin to talk about the Holy Spirit. In today’s Gospel, Jesus, speaking to his disciples the night before he dies, says, “The Advocate, the Holy Spirit, whom the Father will send in my name, will teach you everything and remind you of all that I told you.” In the beginning was the Word, and the Word became flesh. But God spoke his Word into human minds that take it in, mull it over, and look at it from different angles, the idea developing across space and time. And so we need a divine interpreter of the divine Word.

Friends on this Fifth Sunday of Easter, we have an extraordinary Gospel that is at the heart of the Christian thing. Jesus, at the beginning of a lengthy and incredibly rich monologue he gives the night before he dies, says to his disciples, “I give you a new commandment: love one another. As I have loved you, so you also should love one another. This is how all will know that you are my disciples, if you have love for one another.” This is not a sentimental or psychological banality. To understand Jesus here, we have to understand what a strange thing love is—and the way the word is being used.