One cannot stand without the others
To whom is the deposit of faith (Tradition and Sacred Scripture) entrusted?
The Apostles entrusted the deposit of faith to the whole of the Church. Thanks to its supernatural sense of faith the people of God as a whole, assisted by the Holy Spirit and guided by the Magisterium of the Church, never ceases to welcome, to penetrate more deeply and to live more fully from the gift of divine revelation.
To whom is given the task of authentically interpreting the deposit of faith?
The task of giving an authentic interpretation of the deposit of faith has been entrusted to the living teaching office of the Church alone, that is, to the successor of Peter, the Bishop of Rome, and to the bishops in communion with him. To this Magisterium, which in the service of the Word of God enjoys the certain charism of truth, belongs also the task of defining dogmas which are formulations of the truths contained in divine Revelation. This authority of the Magisterium also extends to those truths necessarily connected with Revelation.
What is the relationship between Scripture, Tradition and the Magisterium?
Scripture, Tradition, and the Magisterium are so closely united with each other that one of them cannot stand without the others. Working together, each in its own way, under the action of the one Holy Spirit, they all contribute effectively to the salvation of souls.