Here is a refresher on Dei Verbum's teaching about Sacred Tradition and Sacred Scripture:
Through the living witness of Tradition "the Church’s full Canon of Sacred Books is known, the meaning of the sacred writings is more profoundly understood, and their power is constantly realized." (DV 8)
"Sacred Tradition and Sacred Scripture, then, are linked closely together and communicate with each other." "Sacred Scripture is the utterance of God inasmuch as it is consigned to writing under the inspiration of the divine Spirit. In turn, the Word of God, which was entrusted to the apostles by Christ the Lord and the Holy Spirit, Sacred Tradition hands on fully and completely to the successors of the apostles, so that they, enlightened by the Spirit of truth, may faithfully preserve, explain, and spread it abroad by their preaching." (DV 9)
"It is not from Sacred Scripture alone that the Church draws her certainty about all revealed truths....both Scripture and Tradition are to be accepted and honored with an equal sense of devotion and reverence." (DV 9) "Sacred Tradition and Sacred Scripture together form a single deposit of the Word of God, which is entrusted to the Church." (DV 10).
"But the task of authentically interpreting the Word of God, whether in its written form or in the form of tradition, has been entrusted to the Teaching Office of the Church, whose authority is exercised in the name of Jesus Christ." (DV 10). "At the divine command and with the help of the Holy Spirit, the Teaching Office listens to the Word of God devoutly, guards it with dedication, and faithfully explains it." (DV 10)
"Therefore it is clear that, in accord with God’s most wise arrangement, Sacred Tradition, Sacred Scripture, and the Teaching Office of the Church are so linked and joined together that one cannot stand without the others, but all together, and each in its own way, under the action of the one Holy Spirit, contribute effectively to the salvation of souls." (DV 10)