A. The Sacrifice of the Mass is offered to God for four ends: (1) To honour Him properly, and hence it is called Latreutical; (2) To thank Him for His favours, and hence it is called Eucharistical; (3) To appease Him, make Him due satisfaction for our sins, and to help the souls in Purgatory, and hence it is called Propitiatory; (4) To obtain all the graces necessary for us, and hence it is called Impetratory. …
30 Q. What are the effects which the Most Holy Eucharist produces in us?
A. The principal effects which the Most Holy Eucharist produces in those who worthily receive it are these: (1) It preserves and increases the life of the soul, which is grace, just as natural food sustains and increases the life of the body; (2) It remits venial sins and preserves us from mortal sin; (3) It produces spiritual consolation.
31 Q. Does not the Most Holy Eucharist produce other effects in us?
A. Yes; the Most Holy Eucharist produces three other effects in (1) It weakens our passions, and in particular it allays in us the fires of concupiscence; (2) It increases in us the fervour of charity towards God and our neighbour, and aids us to act in conformity with the will of Jesus Christ; (3) It gives us a pledge of future glory and of the resurrection of our body.