Here are two that I try to say before each Mass:
A DECLARATION OF INTENTION
Eternal Father, I unite myself with the intentions and affections of our Lady of Sorrows on Calvary, and I offer to you the sacrifice that your beloved Son Jesus made of himself upon the cross, and now renews upon this holy altar:
To adore you and give you the honour that is due to you, confessing your supreme dominion over all things, and the absolute dependence of everything upon you, who are our sole and our last end.
To thank you for the countless benefits that I have received.
To appease your justice, aroused against us by so many sins, and to make satisfaction for them.
To implore grace for myself, for N., for all afflicted and sorrowing, for poor sinners, for all the world, and for the holy souls in purgatory. Amen.
- Acta Sanctae Sedis (St Pius X, 8 July 1904)
PRAYER OF ST THOMAS OF AQUINAS
Almighty and everlasting God, behold, I come to the sacrament of your only-begotten Son, our Lord Jesus Christ. I come as one infirm to the physician of life, as one unclean to the fountain of mercy and goodness, as one blind to the light of everlasting brightness, as one poor and needy to the Lord of heaven and earth. Therefore I implore the abundance of your measureless bounty to heal my infirmity, wash my uncleanness, enlighten my blindness, enrich my poverty, and clothe my nakedness, that I may receive the Bread of angels, the King of kings, the Lord of lords, with such reverence and humility, with such sorrow and devotion, with such purity and faith, with such purpose and intention as may be profitable to my soul’s salvation. Grant me, I pray, the grace of receiving not only the sacrament of our Lord’s body and blood, but also the grace and power of the sacrament. O most gracious God, grant me so to receive the body of your only-begotten Son, our Lord Jesus Christ, which he took from the Virgin Mary, as to merit to be incorporated into his Mystical Body, and to be numbered among his members. O most loving Father, give me grace to behold forever your beloved Son with unveiled face, whom I now purpose to receive veiled in the way. Amen.