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 truths, whereas the power of imposing the obligation of belief resides only in the governing body and its Head. But the word “Tradition” does not express any notion of “Faith made obligatory,” but only of “Faith handed down by authentic witnesses.” We shall therefore use the term in the latter sense, although, as a matter of fact, transmission and imposition usually go together.

II. Three phases, more or less divided by time, but still alike in their nature, may be observed in the development and gradual progress of the transmission of revealed doctrine: (1) The Apostles confiding the Deposit of Revelation to the Church with the obligation to continue its promulgation; (2) The transmission of Revelation in and by means of the Church; and (3) The enforcement of belief by the Rule of Faith imposed by the Chiefs of the Apostolate.

1. The Apostles were the original depositaries of Christian Revelation, as well as its first heralds. They handed over to their successors the truths which they possessed, together with the powers corresponding to their mission, This first stage is called Apostolic Tradition, or Apostolic Deposit, the latter expression being derived from 1 Tim. 6:20, “Keep that which is committed to thy trust” (depositum, παραθήκην). All subsequent knowledge of Revelation is drawn from the Apostolic Deposit, which is consequently said to be the Source or Fount of Faith.

The Apostolic Deposit was transmitted in a twofold form: by word of mouth and by writing. The New Testament, although composed by the Apostles or their disciples, is not a mere reproduction of the Apostolic teaching. It was written at God’s command by men under His inspiration, and therefore it is, like the Old Testament, an original and authentic document of Revelation. Both Testaments were, as we shall see, transmitted to the Church by an authoritative act of the Apostolate. The Apostolic Deposit comprises, therefore, the Old Testament, the New Testament, and the oral teaching of the Apostles. By a process of desynonymization, the term “Deposit” has become restricted to the written Deposit, and the term “Tradition” to the oral teaching.