Prayer of St. Ambrose before Mass
Lord Jesus Christ,
We approach your banquet table as saints and sinners, and dare not rely on our own worth,
but only on your goodness and mercy.
Gracious God of majesty and awe,
We seek your protection,
We look for your healing.
We appeal to you, the fountain of all mercy.
Lord Jesus Christ, eternal king,
crucified for us, look upon us with mercy and hear our prayer, for we trust in you.

Merciful Father, purify us in body and soul, and make us worthy to taste the Holy of Holies. May your body and blood, which we intend to receive, unworthy as we are, be for us the remission of our sins, the washing away of our guilt, the end of our evil thoughts, and the rebirth of our better instincts. May it incite us to do the works pleasing to you and profitable to our health in body and soul, and may it deliver us from evil. Amen.

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Act of Oblation before Holy Mass
Eternal Father, we offer you the sacrifice wherein your Son Jesus offered Himself upon the Cross
and which He now renews upon this altar

We adore you and render to you that honor which is your due, acknowledging your dominion over all things and our absolute dependence on you.

You are our first beginning and our last end;
we give you thanks for countless benefits received;
we ask you to forgive our sins and to offer you worthy satisfaction for the same;

Finally to implore your grace and mercy for all of us who will offer this sacrifice today, for all those who are in tribulation and distress, for all of us sinners,
for the whole world and for the souls in purgatory.

We ask this through Christ our Lord.

Amen.

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Prayer Before Mass
Receive, O Holy Trinity this Holy Sacrifice of the Body and Blood of our Lord Jesus Christ, which we, your unworthy servants, desire now to offer to You by the hands of Your minister, with all the sacrifices which have ever been or will be offered to You, in union with that Holy Sacrifice offered by Jesus Christ our Lord at the Last Supper, and on the Altar of the Cross.

We offer it to You with the utmost affection and devotion, out of pure love for Your infinite goodness, and according to the most holy intention of the same Christ our Lord, and of our Holy Mother the Church.

O God, almighty and merciful, grant us through this Holy Sacrifice, joy and peace, a holier life, time to do penance, grace and consolation of the Holy Spirit, and perseverance in good works.

We ask this through Christ, our Lord. Amen.

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Prayer of St. Thomas Aquinas before Mass
Almighty and ever-living God, we approach the sacrament of Your only-begotten Son Our Lord Jesus Christ. We come to the doctor of life unclean to the fountain of mercy, blind to the radiance of eternal light, and poor and needy to the Lord of heaven and earth.

Lord, in your great generosity, heal our sicknesses,
wash away our defilements, enlighten our blindness, enrich our poverty, and clothe our nakedness.

May we receive the bread of angels,
the King of kings and Lord of lords,
with humble reverence, with the purity and faith,
the repentance and love, and the determined purpose
that will help to bring us to salvation.
May we receive the sacrament of the Lord's Body and Blood, and its reality and power.

Loving Father, as on our earthly pilgrimage
we now receive Your beloved Son in the holy sacrifice of this Mass, may we one day see him face to face in glory, who lives and reigns with You for ever. Amen.