Stubborn, you of all people should know that there is a difference between a theological discussion (i.e. theory) and a belief (i.e. way of life). +ABL most certainly entertained sedeism (in many forms), as a theological idea. So did +Bellarmine, Cajetan, and all the other theologians who studied this question.
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Ladislaus is no different from 99% of the people on this forum...he has an opinion/theory. But it's not a BELIEF/fact.
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I know it's a theory (opinion), but you don't know what you're talking about because Lad says right
here "if you don't at least have a positive doubt, then you have no business being a Traditional Catholic, for you are a schismatic". He considers those who understand that the pope is the pope to be in schism - yes, he is confused. Dogmatic doubt IS his position, it IS his belief, it IS NOT simply his opinion according to everything he posts. According to everything he posts he is a confused sede.
Today he goes onto say
here that the foundation of his dogmatic doubtism is the maxim
papa dubius nullus papa. [a doubtful pope is no pope] - which means since he doubts, he believes there is no pope = he is a sedevacantist according to the maxim.
No, that's not true. Sedeism as a THEORY, has been around in the Church for centuries. It's not new.
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What is divisive, what satan has used against the Trad movement, is applying a theory as a BELIEF/fact. Satan has tricked a large # of Trads into 2 errors: 1) That any of the theories on the papal question can be figured out 100%. 2) That this or that opinion is important enough to draw lines in the sand and to stop associating with your fellow Trads.
Yes, it is true that sedeism is a theory, it is also true that many (most?) sedes make this theory into a dogmatically certain fact, which in turn is the cause of division among the faithful. You can blame the whole thing on satan if you like, but that does not make the people who adhere to the error any less culpable.