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[Previously published post, now available here]
Many Catholics have come to understand that active participation in a Mass which is una cum, that is, in which the name of the Modernist “pope” or “local bishop” is placed in the canon, is a sin.
Father Cekada wrote the definitive article on the subject a few years ago, laying out all of the theological points why such an act is contrary to the First Commandment.
Ultimately it boils down to the principle of offering false worship to God. For in order that a Mass be Catholic, and therefore acceptable to God as true worship, it must be offered in persona Ecclesiæ (in the person of the Church) by the priest who is offering it. This means that his act of offering the Mass must be in union with the Catholic Church, which is the Mystical Body of Christ, of which Christ is the Head.