The word "tradition" (Greek paradosis in the ecclesiastical sense; which is the only one in which it is used here; refers sometimes to the thing (doctrine, account, or custom) transmitted from one generation to another sometimes to the organ or mode of the transmission (kerigma ekklisiastikon, predicatio ecclesiastica). In the first sense it is an old tradition that Jesus Christ was born on 25 December, in the second sense tradition relates that on the road to Calvary a pious woman wiped the face of Jesus. In theological language, which in many circumstances has become current, there is still greater precision and this in countless directions. At first there was question only of traditions claiming a Divine origin, but subsequently there arose questions of oral as distinct from written tradition, in the sense that a given doctrine or institution is not directly dependent on Holy Scripture as its source but only on the oral teaching of Christ or the Apostles. Finally with regard to the organ of tradition it must be an official organ, a magisterium, or teaching authority.
Now in this respect there are several points of controversy between Catholics and every body of Protestants. Is all revealed truth consigned to Holy Scripture? or can it, must it, be admitted that Christ gave to His Apostles to be transmitted to His Church, that the Apostles received either from the very lips of Jesus or from inspiration or Revelation, Divine instructions which they transmitted to the Church and which were not committed to the inspired writings? Must it be admitted that Christ instituted His Church as the official and authentic organ to transmit and explain in virtue of Divine authority the Revelation made to men? The Protestant principle is: The Bible and nothing but the Bible; the Bible, according to them, is the sole theological source; there are no revealed truths save the truths contained in the Bible; according to them the Bible is the sole rule of faith: by it and by it alone should all dogmatic questions be solved; it is the only binding authority. Catholics, on the other hand, hold that there may be, that there is in fact, and that there must of necessity be certain revealed truths apart from those contained in the Bible; they hold furthermore that Jesus Christ has established in fact, and that to adapt the means to the end He should have established, a living organ as much to transmit Scripture and written Revelation as to place revealed truth within reach of everyone always and everywhere. Such are in this respect the two main points of controversy between Catholics and so-called orthodox Protestants (as distinguished from liberal Protestants, who admit neither supernatural Revelation nor the authority of the Bible). The other differences are connected with these or follow from them, as also the differences between different Protestant sects--according as they are more or less faithful to the Protestant principle, they recede from or approach the Catholic position.
Between Catholics and the Christian sects of the East there are not the same fundamental differences, since both sides admit the Divine institution and Divine authority of the Church with the more or less living and explicit sense of its infallibility and indefectibility and its other teaching prerogatives, but there are contentions concerning the bearers of the authority, the organic unity of the teaching body, the infallibility of the pope, and the existence and nature of dogmatic development in the transmission of revealed truth. Nevertheless the theology of tradition does not consist altogether in controversy and discussions with adversaries. Many questions arise in this respect for every Catholic who wishes to give an exact account of his belief and the principles he professes: What is the precise relation between oral tradition and the revealed truths in the Bible and that between the living magisterium and the inspired Scriptures? May new truths enter the current of tradition, and what is the part of the magisterium with regard to revelations which God may yet make? How is this official magisterium organized, and how is it to recognize a Divine tradition or revealed truth? What is its proper rôle with regard to tradition? Where and how are revealed truths preserved and transmitted? What befalls the deposit of tradition in its transmission through the ages?
The following are the points to be treated:
I. The existence of Divine traditions not contained in Holy Scripture, and the Divine institution of the living magisterium to defend and transmit revealed truth and the prerogative of this magisterium;
II. The relation of Scripture to the living magisterium, and of the living magisterium to Scripture;
III. The proper mode of existence of revealed truth in the mind of the Church and the way to recognize this truth;
IV. The organization and exercise of the living magisterium; its precise rôle in the defence and transmission of revealed truth; its limits, and modes of action;
V. The identity of revealed truth in the varieties of formulas, systematization, and dogmatic development; the identity of faith in the Church and through the variations of theology.
A full treatment of these questions would require a lengthy development; here only a brief outline can be given.