- The assistance promised the Church’s rulers extends to the threefold function which they must fulfill with regard to religious truth. (a) They are infallible witnesses of revelation, in that they always reverently safeguard the deposit entrusted to the Church; (b) they are infallible teachers of religious truth, in that they always faithfully interpret and explain revealed doctrine; (c) they are infallible arbiters of controversies, in that they always decide without error questions which have arisen on matters of religion.
Sequel
The rule of faith. It seems timely to add here a few remarks on the rule of faith. This term signifies the standard or norm according to which each individual Christian must determine what is the material object of his faith.
Protestants claim that the written Word of God, Holy Scripture, and that alone, is the one rule of faith. Catholics, on the other hand, even though they, too, admit that our faith must be regulated in the final analysis by the Word of God — including tradition as well as Scripture — hold that the proximate and immediate rule of faith — that rule to which each of the faithful and each generation of the faithful must look directly — is the preaching of the Church. And so, according to Catholics, there exists a twofold rule of faith: one remote and one proximate. The remote rule of faith is the Word of God (handed down in writing or orally),
which was directly entrusted to the Church’s rulers that from it they might teach and guide the faithful. The proximate rule of faith, from which
the faithful, one and all, are bound to accept their faith and in accordance with which they are to regulate it, is the preaching of the ecclesiastical magisterium.(27)