More seriously, the Mass is the denial of the perfection and sufficiency of the once-for-all sacrifice of Christ on the cross of Calvary. If it needs to be carried on, perpetuated, renewed re-presented and re-enacted, the implication is that His once-for-all sacrifice was not enough for the forgiveness of His people. Let's say that I go to my friend's house. If there is no answer when I knock at the door, I will renew my efforts and keep on knocking.
Itinuturo ng Iglesiya Katolika na ang tinapay at inumin ay nababago at nagiging tunay na katawan at dugo ni Cristo. Totoo na sinabi ni Jesus, ‘Ito ang aking katawan… Ito ang aking dugo.” Subali’t sa bawa’t pagkakataon ay Kaniyang idinadagdag, “Gawin ninyo ito sa pagala-ala sa akin.” Ang tinapay at inumin ay simbolo ng Kaniyang sakripisyo sa krus ng kalbaryo.