These St Thomas Communion prayers help us to be properly disposed to receive communion and to properly reflect after communion.
St Thomas Aquinas Prayer Before Communion/Before Mass
Almighty and everlasting God, behold I come to the Sacrament of Thine 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, 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 Thy measureless bounty that Thou wouldst vouchsafe 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 unto 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 Thine 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 amongst His members. O most loving Father, give me grace to behold forever Thy beloved Son with His face at last unveiled, whom I now purpose to receive under the sacramental veil here below.
St Thomas Aquinas Prayer After Communion/After Mass
I give thanks to Thee, O Lord, most holy, Father almighty, eternal God, that Thou hast vouchsafed, for no merit of mine own, but out of Thy pure mercy, to appease the hunger of my soul with the precious body and blood of Thy Son, Our Lord Jesus Christ. Humbly I implore Thee, let not this holy communion be to me an increase of guilt unto my punishment, but an availing plea unto pardon and salvation. Let it be to me the armour of faith and the shield of good will. May it root out from my heart all vice; may it utterly subdue my evil passions and all my unruly desires. May it perfect me in charity and patience; in humility and obedience; and in all other virtues. May it be my sure defence against the snares laid for me by my enemies, visible and invisible. May it restrain and quiet all my evil impulses, and make me ever cleave to Thee Who art the one true God. May I owe to it a happy ending of my life. And do Thou, O heavenly Father, vouchsafe one day to call me, a sinner, to that ineffable banquet, where Thou, together with Thy Son and the Holy Ghost, art to Thy saints true and unfailing light, fullness of content, joy for evermore, gladness without alloy, consummate and everlasting happiness. Through the same Christ our Lord.