In the apostolic preaching. . .
In keeping with the Lord's command, the Gospel was handed on in two ways:
- orally "by the apostles who handed on, by the spoken word of their preaching, by the example they gave, by the institutions they established, what they themselves had received - whether from the lips of Christ, from his way of life and his works, or whether they had learned it at the prompting of the Holy Spirit";
- in writing "by those apostles and other men associated with the apostles who, under the inspiration of the same Holy Spirit, committed the message of salvation to writing".
. . . continued in apostolic succession
~ CCC 76
"In order that the full and living Gospel might always be preserved in the Church the apostles left bishops as their successors. They gave them their own position of teaching authority."
Indeed, "the apostolic preaching, which is expressed in a special way in the inspired books, was to be preserved in a continuous line of succession until the end of time.”
This living transmission, accomplished in the Holy Spirit, is called Tradition, since it is distinct from Sacred Scripture, though closely connected to it.
- CCC 77-78
The Word of God
"In the beginning was the Word,
and the Word was with God,
and the Word was God."
~ John 1:1
"In times past, God spoke in partial and various ways to our ancestors through the prophets..."
~ Hebrews 1:1
The Holy Spirit
Since God was the ultimate author of Scripture, God Himself must come to us in helping to interpret His own words.
~ Dei Verbum 12 § 1