The Feast Of The Most Holy Trinity:

  Collect of the Mass:

Omnípotens sempitérne Deus, qui dedísti fámulis tuis in confessióne veræ fídei, ætérnæ Trinitátis glóriam agnóscere, et in poténtia majestátis adoráre Unitátem: quæsumus; ut ejúsdem fídei firmitáte, ab ómnibus semper muniámur advérsis. Per Dóminum nostrum Jesum Christum Fílium tuum. Qui tecum vivit et regnat in unitáte Spíritus Sancti Deus, per ómnia sæcula sæculórum. Amen.

O Almighty and everlasting God, who hast enabled Thy servants, in confessing the true Faith, to acknowledge the glory of the eternal Trinity, and in the power of Majesty to adore its Unity: we beseech Thee, that by steadfastness in the same Faith, we may ever be defended against all adversity. Through our Lord Jesus Christ, Thy Son, who liveth and reigneth with Thee in the unity of the Holy Ghost, God, world without end. Amen.