From Who Shall Ascend?
"We say to you dear faithful people: Ask your priest whether he includes or omits the name of the Pope in his Masses. If he does not, give him no support; and give him no Mass intentions.
Tell him respectfully:
'Father (Bishop), I shall continue to come to Mass here. I have nowhere else to go, and I am bound under pain of mortal sin to assist at Mass on Sunday. But you have done my family and me, and all these other people, a grave injustice. You have exploited my want of theological knowledge to involve me in something which I had no understanding of. I trusted that you knew what you were doing. Now, I am not so sure. I am not going to support your schism in any way.
My family and I have enough difficulty trying to do the right thing, without doing this which is most questionable. Without knowing the science of theology, I can see that it is not necessary for you or for me to know whether Pope John Paul is the legitimate successor of St. Peter. It doesn't hurt anything to pray for him in the Mass; it surely could not be wrong to do so, even if it is an honest mistake. Pope or not, God knows that he who is called John Paul II needs our prayers, as all of us need God's mercy. But to attack the office of the papacy, and to separate oneself from it, is a serious thing to be wrong about.
This Sedevacantism is your opinion. But the Mass not yours, and I know you do not have the right to change a word of it. I have heard you say the same thing about those who brought in the New Mass. And now this is what you have done! You are not being fair, and, it seems to me, you are not being wise. If you insist on being a schismatic, you should leave our Catholic church and gather your own flock from elsewhere. Tell the people from the first day that you do not accept Pope John Paul II as the true Pope, and see how many return."