Here, in this excerpt from the Catechism of the Catholic Church, we see the official Roman Catholic position on the relationship between scripture and tradition:1
The apostolic tradition in the apostolic preaching
76 In keeping with the Lord’s command, the Gospel was handed on in two ways: (1) 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”; and (2) in writing “by those apostles and other men associated with the apostles who, under the inspiration of the same Holy Spirit, com mitted the message of salvation to writing.”
The Apostolic tradition in apostolic succession
77 “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.”
78 This living transmission, accomplished in the Holy Spirit, is called Tradition, since it is distinct from Sacred Scripture, though closely connected to it. Through Tradition, “the Church, in her doctrine, life, and worship perpetuates and transmits to every generation all that she herself is, all that she believes.” “The sayings of the holy Fathers are a witness to the life-giving presence of this Tradition, showing how its riches are poured out in the practice and life of the Church, in her belief and her prayer.”
79 The Father’s self-communication made through his Word in the Holy Spirit, remains present and active in the Church: “God, who spoke in the past, continues to converse with the Spouse of his beloved Son. And the Holy Spirit, through whom the living voice of the Gospel rings out in the Church—and through her in the world—leads believers to the full truth, and makes the Word of Christ dwell in them in all its richness.”
The relationship between tradition and sacred scripture
One common source
80 “Sacred Tradition and Sacred Scripture, then, are bound closely together and communicate one with the other. For both of them, flowing out from the same divine well-spring, come together in some fashion to form one thing and move towards the same goal.” Each of them makes present and fruitful in the Church the mystery of Christ, who promised to remain with his own “always, to the close of the age.”
Two distinct modes of transmission
81 “Sacred Scripture is the speech of God as it is put down in writing under the breath of the Holy Spirit.” “And [Holy] Tradition transmits in its entirety the Word of God which has been entrusted to the apostles by Christ the Lord and the Holy Spirit. It transmits it to the successors of the apostles so that, enlightened by the Spirit of truth, they may faithfully preserve, expound, and spread it abroad by their preaching.”
82 As a result the Church, to whom the transmission and interpretation of Revelation is entrusted, “does not derive her certainty about all revealed truths from the holy Scriptures alone. Both Scripture and Tradition must be accepted and honored with equal sentiments of devotion and reverence.”
Apostolic tradition and ecclesial traditions
83 The Tradition here in question comes from the apostles and hands on what they received from Jesus’ teaching and example and what they learned from the Holy Spirit. The first generation of Christians did not yet have a written New Testament, and the New Testament itself demonstrates the process of living Tradition. Tradition is to be distinguished from the various theological, disciplinary, liturgical, or devotional traditions, born in the local churches over time. These are the particular forms, adapted to different places and times, in which the great Tradition is expressed. In the light of Tradition, these traditions can be retained, modified or even abandoned under the guidance of the Church’s magisterium.
The interpretation of the heritage of faith
The heritage of faith entrusted to the whole of the Church
84 The apostles entrusted the “Sacred deposit” of the faith (the depositum fidei), contained in Sacred Scripture and Tradition, to the whole of the Church. “By adhering to [this heritage] the entire holy people, united to its pastors, remains always faithful to the teaching of the apostles, to the brotherhood, to the breaking of bread and the prayers. So, in maintaining, practicing, and professing the faith that has been handed on, there should be a remarkable harmony between the bishops and the faithful.”
The magisterium of the Church
85 “The task of giving an authentic interpretation of the Word of God, whether in its written form or in the form of Tradition, has been entrusted to the living, teaching office of the Church alone. Its authority in this matter is exercised in the name of Jesus Christ.” This means that the task of interpretation has been entrusted to the bishops in communion with the successor of Peter, the Bishop of Rome.
86 “Yet this Magisterium is not superior to the Word of God, but is its servant. It teaches only what has been handed on to it. At the divine command and with the help of the Holy Spirit, it listens to this devotedly, guards it with dedication, and expounds it faithfully. All that it proposes for belief as being divinely revealed is drawn from this single deposit of faith.”
87 Mindful of Christ’s words to his apostles: “He who hears you, hears me,” the faithful receive with docility the teachings and directives that their pastors give them in different forms.