Dominica Sanctissimæ Trinitatis ~ Duplex I. classis

Sun, 6/15/25:

Today is the feast of the Most Holy Trinity (Trinity Sunday) under the 1954 (double of the I class) and 1962 (I class) rubrics.

Mass: Proper Mass. White. Gloria. Gradual/Alleluia. Credo. Preface of the Most Holy Trinity. Ite. Under 1954, commemoration and Last Gospel of the 1st Sunday after Pentecost. No commemoration of the Sunday under 1962 (Sundays are not commemorated when a feast of Our Lord occurs under 1962, as it is considered an unnecessary duplication).

Office: Proper festal office. White. Matins of 3 nocturns of 9 lessons. At Matins, proper psalms and antiphons. Under 1954, lesson IX of the 1st Sunday after Pentecost. Under 1962, lesson IX = Denique (2nd half of lesson VIII of the old Breviary); no commemoration of the Sunday. Te Deum. At Lauds and the hours, psalms of Sunday (Prime = 53, 118.1, 118.2) with proper antiphons. All else from the proper. Proper Benedictus antiphon. Collect of the feast. Under 1954 only, commemoration of the 1st Sunday after Pentecost at Lauds. No commemorations under 1962. Omit suffrage (1954). At Prime, recite the Athanasian Creed (Quicumque) under both rubrics. (Source: LB236.)

 Introitus

Tob 12:6
Benedícta sit sancta Trínitas atque indivísa Unitas: confitébimur ei, quia fecit nobíscum misericórdiam suam.
Ps 8:2
Dómine, Dóminus noster, quam admirábile est nomen tuum in univérsa terra!
℣. Glória Patri …

Collect
℣. The Lord be with you.
℟. And with thy spirit.
Let us pray.
Almighty, eternal God, You Who have given Your servants, in the confession of the true faith, to acknowledge the glory of the eternal Trinity, and in the power of that majesty to adore its unity, grant, we beseech You, that in the firmness of this faith we may ever be protected from all harm.
Through Jesus Christ, thy Son our Lord, Who liveth and reigneth with thee, in the unity of the Holy Ghost, God, world without end.
℟. Amen.

Let us pray.
Pro Sunday
O God, the Strength of all them that put their trust in thee, mercifully accept our prayers, and because through the weakness of our mortal nature we can do no good thing without thee, grant us the help of thy grace, that in keeping of thy commandments we may please thee, both in will and deed.
Commemoration Sts. Vitus, Modestus and Crescentia, Martyrs
Grant O Lord, we pray, that through the intercession of thy Holy Martyrs Vitus, Modestus and Crescentia, thy Church be not high-minded, but grow in that humility which is pleasing to thee, so that despising evil, she may practice whatever is good with unbounded charity
Through Jesus Christ, thy Son our Lord, Who liveth and reigneth with thee, in the unity of the Holy Ghost, God, world without end.
℟. Amen.

From the Holy Gospel according to St. Matthew
Matt 28:18-20
At that time, Jesus said unto His disciples: All power is given unto Me in heaven and in earth. Go ye, therefore, and teach all nations, baptizing them in the Name of the Father, and of the Son, and of the Holy Ghost. And so on.

Homily by St. Gregory of Nazianzus, Patriarch of Constantinople
Treatise on the Faith
There is no Catholic but knoweth that the Father is a Very Father, the Son a Very Son, and the Holy Ghost a Very Holy Ghost, even as the Lord Himself saith unto His Apostles: “Go ye and baptize all nations in the Name of the Father, and of the Son, and of the Holy Ghost.” This is that Perfect Trinity Who is but One being, and of Whom therefore we testify that His Substance is one. For we make no division in God, as divisions are made in bodies, but we testify, that, according to the power of the Divine Nature, Which standeth not in matter, the Persons named have a real existence, and that God is One.

We do not say, as some have dreamt, that the Begetting of the Son of God is an outgrowing from one part to another part neither do we say that He is the Word in the sense of a mere sound uttered by a voice, but we do believe that these three Names and the Persons meant by them are all of only One Being, One Majesty, and One Power. And therefore we testify that God is one, because this One-ness of His Majesty forbiddeth that we should use the Plural form of speech and say, “Gods.” It is Catholic language to say, “Father and Son,” but we cannot and must not say that the Father and the Son are two gods. And that, not because the Son of God is not by Himself God; yea, He is Very God of Very God but because we know that the Son of God is not from elsewhere, but from the One Father Himself, and therefore we say that God is One. This is the doctrine which Prophets and Apostles have delivered; this is the doctrine which the Lord Himself taught when He said: “I and the Father are One,” John x. 30, that is, He meant, as touching the one Divine Being, but as touching Persons, We are distinct.

Post Communion
P. The Lord be with you.
S. And with thy spirit.
Let us pray.
May the reception of this sacrament, O Lord our God, and the profession of our faith in the eternal holy Trinity and undivided Unity, benefit us for the salvation of body and soul.
Through Jesus Christ, thy Son our Lord, Who liveth and reigneth with thee, in the unity of the Holy Ghost, God, world without end.
℟. Amen.

Let us pray.
For Sunday
Filled, O Lord, as we are with so great bounties, we beseech thee; that we may receive the gifts of salvation, and never cease from thy praise.
Commemoration Sts. Vitus, Modestus and Crescentia, Martyrs
We, who have been filled with thy solemn blessing, ask, O Lord, that, through the intercession of thy holy Martyrs Vitus, Modestus and Crescentia, this healing sacrament may benefit both our bodies and our souls.
Through Jesus Christ, thy Son our Lord, Who liveth and reigneth with thee, in the unity of the Holy Ghost, God, world without end.
℟. Amen.