Happy Solemnity of the Most Blessed and Most Holy Almighty Trinity +Father, Son, and Holy Spirit+!

It has my favorite Mass preface (“It is truly right and just”) prayer of all time!

Vere dignum et iustum est, æquum et salutare,
nos tibi semper et ubique gratias agere:
Domine, sancte Pater, omnipotens æterne Deus:

Qui cum Unigenito Filio tuo et Spiritu Sancto
unus es Deus, unus es Dominus:
non in unius singularitate personæ,
sed in unius Trinitate substantiæ.

Quod enim de tua gloria, revelante te, credimus,
hoc de Filio tuo,
hoc de Spiritu Sancto,
sine discretione sentimus.
Ut in confessione veræ sempiternæque Deitatis,
et in personis proprietas,
et in essentia unitas,
et in maiestate adoretur æqualitas.

Quem laudant Angeli atque Archangeli,
Cherubim quoque ac Seraphim,
qui non cessant clamare quotidie, una voce dicentes:

It is truly right and just, our duty and our salvation,
always and everywhere to give you thanks,
Lord, holy Father, almighty and eternal God.

For with your Only Begotten Son and the Holy Spirit
you are one God, one Lord:
not in the unity of a single person,
but in a Trinity of one substance.

For what you have revealed to us of your glory
we believe equally of your Son
and of the Holy Spirit,
so that, in the confessing of the true and eternal Godhead,
you might be adored in what is proper to each Person,
their unity in substance,
and their equality in majesty.

For this is praised by Angels and Archangels,
Cherubim, too, and Seraphim,
who never cease to cry out each day,
as with one voice they acclaim:

SANCTUS SANCTUS SANCTUS

HOLY HOLY HOLY

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Original image: Ethiopian icon of the Holy Trinity found: http://sacredartpilgrim.com/schools/view/8