Alternate expressions of the proposition:
1. One who knowingly, consciously, and willingly publicly asserts a proposition that is in direct contradiction to a Church teaching that must be believed with Divine and Catholic Faith separates himself from the Church by that very fact.
2. One who knowingly, consciously, and willingly publicly denies or doubts a Church teaching that must be believed with Divine and Catholic Faith separates himself from the Church by that very fact.
Clarifications:
1. One who is separated from the Church is not a member of the Church. He goes from being Catholic to non-Catholic.
2. The separation takes place at the very instant the sin is committed.
3. The proposition is independent of its application to a particular case.