For something to be a sin you must have material. I’ve underscored fomr your post what could constitute material for sin.
What if the person in the pew purposefully intends to go to such a Mass and has other options? Perhaps they do so because they find the music more appealing, or they are opposed to Church authority; or perhaps they don’t care for formal reverent worship and desire more laid back and spontaneous services?
Couldn’t it be sins in these instances as long as they have the intent to do what is wrong and know that the Church says that such masses are wrong? And by participating in such masses, aren’t they, to some degree or another, approving of the actions?
The Church is not saying that these are sins. The Church is saying that these are wrong and inappropriate for mass. In and of themselves, many of these things are not materially sinful. Something can be wrong, but not materially sinful, such as liturgical dance.
Many saints throughout the history of the Church refused to receive Communion from the hands of those who taught heresies.
This was a poor judgement on the part of the saint. St. Francis made this very clear in his theology. The priest’s sinfulness does not take away from the Eucharist.
All priests can validly consecrate, even those who are excommunicated or defrocked. You cannot stip an ordained minister of the Sacrament of Holy Orders. You can suspend him, dispense him, even excommunicate him, but he is a priest forever.
Scripture also clearly states that after the first or second admonition, avoid a heretic (Tit 3:10). Wouldn’t this teaching especially apply to heretical priests who teach heresies from their pulpits, perform irreverent services, and treat the Eucharist as if it were common food?
If the priest’s intention is to consecrate, he uses the correct words of consecration, uses the correct elements (bread and wine), the teaching of the Church is that the Eucharist is valid.
This scripture passage does not apply in this case. You are to avoid this person’s teaching, but you do not have to avoid the sacrament.
In a situation such as the SSPX and the Orthodox, the consecration is still valid, but unless there is not other place for you to worship, you may not receive communion at one of their masses, because they are not in communion with the Bishop of Rome, not because the sacrament is invalid.
In fact, in the case of the Orthodox, the sacrament is valid and licit. In the case of the SSPX, the sacrament is valid, but ilicit.
The reason beeing that the Orthodox are not excommunicated. The excommunication and the anathemas were lifted by Paul VI.
Nonetheless, if the priest is in good standing with the Catholic Church, even if he’s an odd ball, the sacrament if both valid and licit. You incur no sinfulness receiving from him.
JR
