A Prayer After Mass (by St. Thomas Aquinas)

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 armor of faith and the shield of goodwill. 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 defense 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 it to 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, the fullness of content, joy for evermore, gladness without alloy, consummate and everlasting happiness. Through the same Christ our Lord. Amen.