Catechism of the Catholic Church
Here are some doctrines from the Catechism of the Catholic Church to refresh our minds about what the Church teachers regarding the Eucharist.
The Eucharistic particles is Christ:
1377 The Eucharistic presence of Christ begins at the moment of the consecration and endures as long as the Eucharistic species subsist. Christ is present whole and entire in each of the species and whole and entire in each of their parts, in such a way that the breaking of the bread does not divide Christ.
Sunday Obligation and Excuses:
2181 The Sunday Eucharist is the foundation and confirmation of all Christian practice. For this reason the faithful are obliged to participate in the Eucharist on days of obligation, unless excused for a serious reason (for example, illness, the care of infants) or dispensed by their own pastor. Those who deliberately fail in this obligation commit a grave sin.
Worthiness:
1385 To respond to this invitation we must prepare ourselves for so great and so holy a moment. St. Paul urges us to examine our conscience: "Whoever, therefore, eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty of profaning the body and blood of the Lord. Let a man examine himself, and so eat of the bread and drink of the cup. For any one who eats and drinks without discerning the body eats and drinks judgment upon himself."
218 Anyone conscious of a grave sin must receive the sacrament of Reconciliation before coming to communion.
Unintentional Sacrilege is still Sacrilege:
2120 Sacrilege consists in profaning or treating unworthily the sacraments and other liturgical actions, as well as persons, things, or places consecrated to God. Sacrilege is a grave sin especially when committed against the Eucharist, for in this sacrament the true Body of Christ is made substantially present for us.
(A man of goodwill principle does not go knowingly and willingly to a Novus Ordo Mass, where Christ is abused by Communion in the hand and is trampled on, and then say he unintentionally trampled on Christ. He will know better to stop this immediately.)
The End does not Justify the Means:
1759 "An evil action cannot be justified by reference to a good intention." (cf. St. Thomas Aquinas, Dec. praec. 6). The end does not justify the means. A man of goodwill principle does not choose to fulfil his Sunday Mass precept, by going to a Novus Ordo Mass, knowing he will commit sacrilege, by trampling on the Eucharistic particles. Instead he will go to an exclusive TLM church.
Conscious of a problem:
Can. 916 A person who is conscious of grave sin is not to celebrate Mass or receive the body of the Lord without previous sacramental confession unless there is a grave reason and there is no opportunity to confess; in this case the person is to remember the obligation to make an act of perfect contrition which includes the resolution of confessing as soon as possible.
State of Grace:
1415 Anyone who desires to receive Christ in Eucharistic communion must be in the state of grace. Anyone aware of having sinned mortally must not receive communion without having received absolution in the sacrament of penance.
