Bishop Sanborn responds to the "rupture theology" article

[lamentabili sane]

...and one of my personal favorites:

"To act against one's honestly erroneous conscience is to sin." (Archbishop Lefebvre, Religious Liberty Questioned, Angelus Press, p. 10)

WOW!

Does this mean if I believe that the Novus Ordo is evil I cannot attain it in conscience?

Yes, actually.  To knowingly violate one's conscience is a sin.

But I don't think that one can say that there is a right to follow one’s "conscience", if it involves a transgression of the moral law. Schoolman is saying there is a duty to follow one’s "conscience", even if it is in error…and it matters not what that error might be.

The proper definition of conscience is needed here.