From the Roman Breviary: The Holy Trinity:

 

 

Matins/Office of Readings

 

Summæ Parens cleméntiæ,

Mundi regis qui máchinam,

Uníus et substántiæ,

Trinúsque persónis Deus:

 

Da déxteram surgéntibus,

Exsúrgat et mens sóbria,

Flagrans et in laudem Dei

Grates repéndet débitas.

 

Deo Patri sit glória,

Natóque Patris único,

Cum Spíritu Paráclito,

In sempitérna sǽcula.

Amen.

 

O God, by whose command is swayed

This ordered world which thou hast made;

Parent of heavenly clemency,

In nature One, in persons Three;

 

Assist us while our minds we raise,

Inflamed with thy immortal praise;

That with our sober thoughts, we may

Forever our thanksgiving pay.

 

May age by age thy wonders tell,

Eternal praise thy works reveal,

And sing with the celestial host

The Father, Son, and Holy Ghost.

Amen.

 

Lauds

 

Tu, Trinitátis Unitas,

Orbem poténter quæ regis,

Atténde laudis cánticum,

Quod excubántes psállimus.

 

Ortus refúlget Lúcifer,

Præítque solem núntius:

Cadunt ténebræ nóctium:

Lux sancta nos illúminet.

 

Deo Patri sit glória,

Eiúsque soli Fílio,

Cum Spíritu Paráclito,

Nunc, et per omne sǽculum.

Amen.

 

O thou, who dost all nature sway,

Dread Trinity in Unity,

Accept the trembling praise we pay

To thy eternal majesty.

 

The star that heralds in the dawn

Is slowly fading in the skies;

The darkness melts; O thou true light,

Upon our darkened souls arise.

 

To God the Father glory be,

And to the sole-begotten Son,

And Holy Ghost co-equally,

While everlasting ages run.

Amen.

 

Vespers

 

Iam sol recédit ígneus:

Tu, lux perénnis, Únitas,

Nostris, beáta Trínitas,

Infúnde lumen córdibus.

 

Te mane laudum cármine,

Te deprecámur véspere;

Dignéris ut te súpplices

Laudémus inter cǽlites.

 

Patri, simúlque Fílio,

Tibíque, Sancte Spíritus,

Sicut fuit, sit iúgiter

Sæclum per omne glória.

Amen.

 

As fades the glowing orb of day,

To thee, great source of light, we pray;

Blest Three in One, to every heart

Thy beams of life and love impart.

 

At early dawn, at close of day,

To thee our vows we humbly pay;

May we, mid joys that never end,

With thy bright saints in homage bend.

 

To God the Father, and the Son,

And Holy Spirit, Three in One,

Be endless glory, as before

The world began, so evermore.

Amen.