Hierarchy of Truths & the TruthFr. William Most demonstrates that although there is a hierarchy of truths in the faith, it is another hierarchy that determines what we must believe: the Magisterium.
Infallibilityby Ronald Walls (from Catholic Faith, March/April 1998)
Understanding the Infallibility Teachingby Russell Shaw. Catholics are under the impression that unless a doctrine is infallibly taught, they don't have to abide by it.