[quote]honest_lifter wrote:
How is it that the pope can be called infallible? I understand it to mean that the Pope, and the body of bishops cannot be wrong. (not that they don’t sin) How is it that they can say this, and still believe that they are staying “within the limits of personal humility defined by the Scriptures”? (yes this is a tangent, but since you brought it up…)[/quote]
You are correct, infallibility has nothing to do with sinfulness. Paul spoke infallibly and he was Chief of sinners.
"As regards matter, only doctrines of faith and morals, and facts so intimately connected with these as to require infallible determination, fall under the scope of infallible ecclesiastical teaching. These doctrines or facts need not necessarily be revealed; it is enough if the revealed deposit cannot be adequately and effectively guarded and explained, unless they are infallibly determined.
As to the organ of authority by which such doctrines or facts are determined, three possible organs exist. One of these, the magisterium ordinarium, is liable to be somewhat indefinite in its pronouncements and, as a consequence, practically ineffective as an organ. The other two, however, are adequately efficient organs, and when they definitively decide any question of faith or morals that may arise, no believer who pays due attention to Christ’s promises can consistently refuse to assent with absolute and irrevocable certainty to their teaching.
But before being bound to give such an assent, the believer has a right to be certain that the teaching in question is definitive (since only definitive teaching is infallible); and the means by which the definitive intention, whether of a council or of the pope, may be recognized have been stated above. It need only be added here that not everything in a conciliar or papal pronouncement, in which some doctrine is defined, is to be treated as definitive and infallible. For example, in the lengthy Bull of Pius IX defining the Immaculate Conception the strictly definitive and infallible portion is comprised in a sentence or two; and the same is true in many cases in regard to conciliar decisions. The merely argumentative and justificatory statements embodied in definitive judgments, however true and authoritative they may be, are not covered by the guarantee of infallibility which attaches to the strictly definitive sentences â?? unless, indeed, their infallibility has been previously or subsequently established by an independent decision." - CATHOLIC ENCYCLOPEDIA: Infallibility