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The feast of the Most Holy Trinity is celebrated today, being the Octave Day of Pentecost. Oddly, this feast which is celebrated on this day by most Western Christians is actually of an English Origin. St. Thomas Beckett had been consecrated on this particular Sunday in 1162 AD, and encouraged the use of a votive mass composed by the English monk named Alcuin.

At the Mass

The following is taken from:

The Introit

Antiphon: Tobit 12 Blessed be the Holy Trinity, and the undivided Unity: we will praise and glorify him, because he hath shewed his mercy upon us.

Verse: Let us bless the Father and the Son: with the Holy Spirit.

Glory be to the Father, and to the Son, and to the Holy Ghost; As it was in the beginning, is now, and ever shall be, world without end. Amen.

Repeat the Antiphon Blessed be the Holy ...

The English Gradual: Part II - The Proper, Pages 95-97

The Collect

Almighty and everlasting God, who hast given unto us thy servants grace, by the confession of a true faith, to acknowledge the glory of the eternal Trinity, and in the power of the Divine Majesty to worship the Unity: We beseech thee, that this holy faith may evermore be our defence against all adversities; who livest and reignest, one God, world without end. Amen.

The Book of Common Prayer (1962), Pages 214-215

The Lesson
Revelation 4. 1.

After this I saw, and behold, a door was opened in heaven: and the first voice which I heard was as it were of a trumpet talking with me; which said, Come up hither, and I will show thee things which must be hereafter. And immediately I was in the Spirit; and behold, a throne was set in heaven, and one sat on the throne: and he that sat was to look upon like a jasper and a sardius stone: and a rainbow round about the throne, in sight like unto an emerald. And round about the throne four and twenty seats; and upon the seats I saw four and twenty elders sitting, clothed in white raiment; and on their heads crowns of gold: and out of the throne proceed lightnings and thunderings and voices. And seven lamps of fire burning before the throne, which are the seven spirits of God; and before the throne as it were a sea of glass, like unto crystal; and in the midst of the throne, and round about the throne, four living creatures, full of eyes before and behind; the first one like a lion, and the second like a calf, and the third having a face like a man, and the fourth like a flying eagle; and every one of them had six wings; around and within they are full of eyes; and they rest not day or night, saying, Holy, Holy, Holy, Lord God the Almighty, Which was, and which is, and which is to come. And when those living beings give glory and honour and thanks to him that sitteth upon the throne, who liveth for ever and ever, the four and twenty elders fall down before him that sitteth upon the throne, and worship him that liveth for ever and ever, and cast their crowns before the throne, saying, Thou art worthy, O Lord, To receive glory and honour and power; For thou hast created all things, And for thy pleasure they are, and were created.

Revelation 4:1-11 NIV KJV NRSV NASB RSV NKJV ESV

The Book of Common Prayer (1962), Pages 215-216

Gradual and Alleluia

Daniel 3 Blessed art thou, O Lord, which beholdest the great deep: and sittest upon the Cherubim. O, bless the Lord of heaven: for he hath shewed mercy upon us.

Alleluia. Alleluia. Blessed art thou, O Lord God of our fathers: and worthy to be praised for ever more. Alleluia.

The English Gradual: Part II - The Proper, Pages 95-97

The Gospel
St. John 3. 1.

There was a man of the Pharisees, named Nicodemus, a ruler of the Jews: the same came to Jesus by night, and said unto him, Rabbi, we know that thou art a teacher come from God: for no man can do these signs that thou doest, except God be with him. Jesus answered and said unto him, Verily, verily I say unto thee, Except a man be born again, he cannot see the kingdom of God. Nicodemus saith unto him, How can a man be born when he is old? can he enter the second time into his mother’s womb, and be born? Jesus answered,, Verily, verily I say unto thee, Except a man be born of water and of the Spirit, he cannot enter into the kingdom of God. That which is born of the flesh is flesh; and that which is born of the Spirit is spirit. Marvel not that I said unto thee, Ye must be born again. The wind bloweth where it listeth, and thou hearest the sound thereof, but canst not tell whence it cometh, and whither it goeth; so is every one that is born of the Spirit. Nicodemus answered and said unto him, How can these things be? Jesus answered and said unto him, Art thou a master of Israel, and knowest not these things? Verily, verily I say unto thee, We speak that we do know, and testify that we have seen; and ye receive not our witness. If I have told you earthly things, and ye believe not; how shall ye believe, if I tell you of heavenly things? And no man hath ascended up to heaven, but he that came down from heaven, even the Son of man, who is in heaven. And as Moses lifted up the serpent in the wilderness, even so must the Son of man be lifted up: that whosoever believeth in him should not perish, but have eternal life.

John 3:1-15 NIV KJV NRSV NASB RSV NKJV ESV

The Book of Common Prayer (1962), Pages 216-217

The Offertory

Tobit 12 Blessed be God the Father, and the only begotten Son of God; and blessed be the Holy Spirit: for the mercy he hath done unto us.

The English Gradual: Part II - The Proper, Pages 95-97

The Preface

Upon Trinity Sunday.

Whom with thy co-eternal Son and Holy Spirit we confess as one God, in Trinity of Persons and in Unity of Substance. For that which we believe of thy glory, O Father, the same we believe of the Son, and of the Holy Spirit. Therefore with Angels, etc.

The Book of Common Prayer (1962), Page 81

The Communion

Tobit 12 Let us bless the God of heaven; and in the sight of all living will we give thanks unto him: because he hath done to us ward after his loving kindness.

The English Gradual: Part II - The Proper, Pages 95-97

At the Offices

Morning Prayer

Psalm(s): 92-93
First Lesson: Isaiah 6:1-8
Second Lesson: Mark 1:1-13
NIV KJV NRSV NASB RSV NKJV ESV

Evening Prayer

Psalm(s): 146, 150
First Lesson: Isaiah 40:12-end
Second Lesson: 1 Peter 1:1-12
NIV KJV NRSV NASB RSV NKJV ESV

For the Ferial Days

  Morning Prayer Evening Prayer
First Lesson Second Lesson First Lesson Second Lesson
Monday Job 1 James 1 Job 2 Mark 1:14-31
NIV KJV NRSV NASB RSV NKJV ESV
Tuesday Job 3 James 2:1-13 Job 4 Mark 1:32-end
NIV KJV NRSV NASB RSV NKJV ESV
Wednesday Job 5 James 2:14-end Job 6 Mark 2:1-22
NIV KJV NRSV NASB RSV NKJV ESV
Thursday* Job 7 James 3 Job 8 Mark 2:23-3:12
NIV KJV NRSV NASB RSV NKJV ESV
Friday Job 9 James 4 Job 10 Mark 3:13-end
NIV KJV NRSV NASB RSV NKJV ESV
Saturday Job 11 James 5 Job 12 Mark 4:1-34
NIV KJV NRSV NASB RSV NKJV ESV

The Book of Common Prayer (1962), Pages xxx and xxxi