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The Secret (Latin: Secreta, oratio secreta) is the prayer said in a low voice by the celebrant at the end of the Offertory in the Mass. It is the original and for a long time was the only offertory prayer. It is said in a low voice merely because it was said at the same time the choir sang the Offertory, and it has inherited the special name of Secret as being the only prayer said in that way at the beginning.

The silent recital of the Canon (which is sometimes called "Secreta") did not begin earlier than the sixth or seventh century. The present offertory prayers are late additions, not made in Rome until the fourteenth century. Before that the offertory act was made in silence, and the corresponding prayer that followed it was the Secret. Since it is said silently the Secret is not introduced by the invitation to the people: "Oremus."

The Secret is part of the Accentus of the Mass, changing for each feast or occasion, and is built up in the same way as the Collect. The Secret too alludes to the saint or occasion of the day. But it keeps its special character inasmuch as it nearly always (always in the case of the old ones) asks God to receive the eucharist and sanctify it. All this is found exactly as now in the earliest Secrets we know, those of the Leonine Sacramentary. Already there the Collect, Secret, Postcommunion, and "Oratio ad populum" form a connected and homogeneous group of prayers. So the multiplication of Collects in one Mass entailed a corresponding multiplication of Secrets. For every Collect the corresponding Secret is said.

The name "Secreta" is used in the Gelasian Sacramentary; in the Gregorian book these prayers have the title "Super oblata." Both names occur frequently in the early Middle Ages. In Ordo Rom. II the prayer is called "Oratio super oblationes secreta". In the Gallican Rite there was also a variable offertory prayer introduced by an invitation to the people; it had no special name. In the Ambrosian Rite the prayer called "Oratio super sindonem" (Sindon for the veil that covers the oblata) is said while the Offertory is being made and another "Oratio super oblata" follows after the Creed, just before the Preface. In the Mozarabic Rite, after an invitation to the people, to which they answer "Præsta æterne omnipotens Deus," the celebrant says a prayer without a special name that corresponds to the Secret and continues at once to the memory of the saints and intercession prayer. In these other Western rites this prayer is said aloud. All the Eastern rites have prayers, now said silently, after the Great Entrance, when the gifts are brought to the altar and offered to God, but they are invariable and none of them can be exactly compared to the Roman Secret.

At either high or low Mass the celebrant, having answered "Amen" to the prayer "Suscipiat Dominus sacrificium", says in a low voice the Secret or Secrets in the same order as he said the Collects, finding each at its place in the proper Mass. He ends the first and last only with the form "Per Dominum nostrum" (as in the Collects). The last clause of the last Secret: "Per omnia sæcula sæculorum" is said or sung aloud, forming the ekphonesis before the Preface.

This article incorporates text from the public-domain Catholic Encyclopedia of 1913.

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Ordinary: Proper: Accentus:		Kyrie | Gloria | Credo | Sanctus | Agnus Dei | Ite missa est or Benedicamus Domino Introit | Gradual | Alleluia or Tract | Sequence | Offertory | Communion Collect | Epistle | Gospel | Secret | Preface | Canon | Postcommunion