We now begin Chapter II of the Dogmatic Constitution on Divine Revelation where the Council discusses “Handing on Divine Revelation.”
7. In His gracious goodness, God has seen to it that what He had revealed for the salvation of all nations would abide perpetually in its full integrity and be handed on to all generations. Therefore Christ the Lord in whom the full revelation of the supreme God is brought to completion (see 2 Cor. 1:20; 3:13; 4:6), commissioned the Apostles to preach to all men that Gospel which is the source of all saving truth and moral teaching (cf. Matt. 28:19-20, and Mark 16:15; Council of Trent, session IV, Decree on Scriptural Canons: Denzinger 783 ), and to impart to them heavenly gifts. This Gospel had been promised in former times through the prophets, and Christ Himself had fulfilled it and promulgated it with His lips. This commission was faithfully fulfilled by the Apostles who, by their oral preaching, by example, and by observances handed on what they had received from the lips of Christ, from living with Him, and from what He did, or what they had learned through the prompting of the Holy Spirit. The commission was fulfilled, too, by those Apostles and apostolic men who under the inspiration of the same Holy Spirit committed the message of salvation to writing (cf. Council of Trent, loc. cit.; First Vatican Council, session III, Dogmatic Constitution on the Catholic Faith, Chap. 2, “On revelation:” Denzinger 1787 ).
But in order to keep the Gospel forever whole and alive within the Church, the Apostles left bishops as their successors, “handing over” to them “the authority to teach in their own place”(St. Irenaeus, “Against Heretics” III, 3, 1: PG 7, 848; Harvey, 2, p. 9). This sacred tradition, therefore, and Sacred Scripture of both the Old and New Testaments are like a mirror in which the pilgrim Church on earth looks at God, from whom she has received everything, until she is brought finally to see Him as He is, face to face (see 1 John 3:2).
This paragraph really focuses on God’s ultimae plan for how revelation is handed on: it starts with Jesus, gets passed on to the Apostles, and then on to their successors. That is the basic formula God uses which gives us assurance that revelation as we see it today is still that same authentic revelation brought by Jesus.