Trinity Sunday is the one Sunday in the year when even seasoned preachers get a little nervous. We feel like we ought to explain the Trinity — three Persons, one God, one essence, three subsistences, eternally begotten, proceeding from the Father (and the Son, if we are being Western about it). And we reach for analogies. The shamrock. Water and ice and steam. The three-part egg. Every one of which, the Church has gently pointed out for sixteen hundred years, is technically a heresy. You cannot even use the props without getting in trouble.
So let me try a different door tonight.
Look at our Gospel. Nicodemus comes to Jesus by night. He is a Pharisee, a respected teacher, a member of the council — and he sneaks through the streets of Jerusalem after dark with a question he cannot ask in the daylight. Rabbi, we know that thou art a teacher come from God. That is how he opens. Polite. Careful. The careful opening of a man who actually has no idea what he is getting into.
And Jesus, characteristically, does not answer the careful opening. He answers what Nicodemus actually wants to know. Except he answers it in a way that leaves Nicodemus more confused than before. Ye must be born again. Nicodemus, baffled: How can a man be born when he is old? And Jesus presses in further — born of water and the Spirit, the wind blows where it listeth, the Son of man must be lifted up. By the end of the passage Nicodemus has stopped talking. He has come for clarity and received instead a glimpse of something vast.
Most of us come to the doctrine of the Trinity the way Nicodemus came to Jesus: at night, quietly, hoping no one will notice we do not really understand it.
I think this is the right Gospel for Trinity Sunday, and not because it is a particularly Trinitarian text — though the Father, the Son, and the Spirit are all there. I think it is the right Gospel because Nicodemus is us. And we want a clean answer. A diagram. A formula we can memorize.
But the Trinity is not something that was figured out in a council and handed down for us to memorize. It is something the Church confessed because the alternatives did not fit what had actually happened. The first Christians prayed to the Father whom Jesus called Father. They worshipped Jesus as Lord — not later, after some doctrinal development, but immediately, scandalously, in the first generation. And they knew the Spirit as God’s own presence breathing in them. Three. And yet, with every nerve in their Jewish bones, they confessed: the Lord our God is one. The doctrine of the Trinity is what you get when you refuse to give up either half of that.
Which means Trinity Sunday is not an exam. It is a thanksgiving. We are not gathered tonight to be tested on whether we can distinguish the procession of the Spirit from the eternal generation of the Son. We are gathered to give thanks that the God who made the world is not a distant force or a solitary monarch, but love — love that gives, love that receives, love that overflows. The Father loves the Son in the Spirit, and that love spills out into a created world, into a manger, into a borrowed tomb, into us.
Look at our Epistle. John on Patmos sees the throne, and around the throne the four living creatures who never rest, day and night, saying Holy, holy, holy. Three holies. The Church has always heard that as a hint, a whisper from heaven of what Israel was only beginning to glimpse: that the holiness of God is not lonely. It is full. It is, somehow, plural in its unity, communion in its very being.
So when you and I come together on a Sunday evening — a small congregation, scattered across screens, a handful of voices — we are not just doing a religious exercise. We are being caught up. The same Spirit who proceeds from the Father is praying in us. The same Son who was lifted up on the cross is making us his Body. The same Father who set the stars in their courses is, at this moment, our Father.
And if some of that still feels mysterious — if you, like Nicodemus, leave tonight with more questions than answers — that is not a failure. That is the proper posture before the living God. How can these things be? Nicodemus asked. Jesus did not scold him for asking. He just kept teaching.
Come by night, friends. Come with your questions. The Trinity is not waiting for us to pass a test. The Father sent the Son not to grade us but to save us — for God so loved the world. Come, and be loved by the Three who are One.
Holy, holy, holy.
AMEN.