Prayer of St. Thomas Aquinas after Mass

Lord, holy Father, almighty and ever-living God, I thank you.
For though I am a sinner and your unprofitable servant,
you have fed me with the precious Body and Blood of your Son, our Lord Jesus Christ.
You did this not because I deserved it, but because you are kind and merciful.
I pray that this holy Communion may not add to my guilt and punishment,
but may lead me to forgiveness and salvation.
May it be for me the armor of faith and the shield of good will.
May it purify me from evil ways and put an end to my base passions.
May it bring me charity and patience, humility and obedience,
and may it strengthen my power to do every kind of good.
May it be a strong defense against the deceit of all my enemies, visible and invisible.
May it calm perfectly all my evil impulses, bodily and spiritual.
May it unite me more closely to you, the one true God;
may it bring me full possession of the goal I am longing for.
And I pray that you will lead me, a sinner, to the magnificent banquet where you,
with your Son and the Holy Spirit, are for all your saints
the true light, total fulfillment, everlasting joy, gladness without end,
exquisite delight, and most perfect happiness.
Grant this through Christ our Lord.