8 Nov 2025
et SpiRItui Sancto
SpiRItui or SPIriTUi? What’s the difference, who cares and why?
This puzzle jumped out at me a while ago. I started listening and assembled a few examples, but it wasn’t until this tripped up one of my choir members that it seemed worthwhile to put an explainer together. Today we’ll briefly look at why mastering this word will help you, what the different endings mean and why Spiritus is so odd in Latin. In the recording I will include clips from Pope Pius XII, Pope John Paul II and Pope Benedict XVI and Cardinal Burke.
First, a warning, don’t be a fusspot. It is very common and normal for people speaking Latin to mix things up. Most of the time it’s not worth correcting someone’s pronunciation. As long as you’re generally intelligible, then we can live with funny quirks.
Except if you’re singing a psalm in a tone with a final of two accents, then you will need to know the accent in Spiritui falls on the RI and not the TU. This occurs in Mode 5 and Mode 7.
As choir leader, I care that people sing the right note on the right syllable, so although I do my best to remember that pronunciation can vary, I am in a wonderful position where I have the final say on how things are sung in my choir. That said, you probably go with what your choirmaster says, but I’ll plough ahead because I think I’m right and because it’s one of those details which is interesting in a small way.
Now, the word Spiritus is an interesting case. It ends with “US” which makes you think it’s a normal 2nd declension noun, but turns out it’s a member of a much smaller group, the 4th declension nouns. However, it is frequently paired with the adjective “SANCTUS” which follows the 2nd declension noun endings. Most of the time, in Latin, your adjectives and nouns share endings, so you can be tempted to say Spiritus Sanctus, Spirito Sancto, Spiriti Sancti, but in this case that doesn’t always work.
When the Holy Spirit is the Subject of the sentence, as in “May Almighty God bless, you, Father, Son and Holy Ghost” then you do have Spíritus Sanctus. However, when making the sign of the Cross, the Three Persons of the Blessed Trinity are in the Genitive Case, “Of the Father, Of the Son, Of the Holy Ghost” and we use “Spíritus Sancti”. Lastly, the case under the microscope today, in the Gloria Patri, we use the Dative Case, “Glory Be To the Father, To the Son, To the Holy Ghost” and here we have “Spirítui Sancto”.
In Latin the last syllable is never accented. The accent falls on either the second last (penultimate) or third last (antepenultimate) syllable. In Classical Latin we talk about the quantity of different syllables, whether it’s long or short. If the penultimate syllable is long, it gets the accent. If the penultimate syllable is short, then the accent goes on the antepenultimate syllable. In Spiritui, the first and last syllables are long, so both middle syllables are short, so the accent falls on the antepenultimate, which is the RI.
So that gives you too much information on why we say SpiRItui in the Gloria Patri.
Hearing people pray the Gloria Patri in Latin is wonderful, regardless of accuracy. A long time ago I made a quick video saying that pronouncing Latin is easy, and I guess there is still some truth in that, but as you can see here, there is usually more out there to learn. I hope this discussion helps you pronounce the Gloria Patri with confidence and accuracy so that if you ever join a choir and sing a Gloria Patri in mode five or seven, then you will easily hit the right notes on the right syllables.
God bless you.
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