The Catechism of the Catholic Church specifically defines the magisterium. I personally love the ease for which it explains the truth of magisterial teaching. The excepts below come directly from the Catechism. We should be thankful for all eternity to St. John Paul II for commissioning this great masterpiece.
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.”47 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.”48
87 Mindful of Christ’s words to his apostles: “He who hears you, hears me”,49 the faithful receive with docility the teachings and directives that their pastors give them in different forms.
The dogmas of the faith
88 The Church’s Magisterium exercises the authority it holds from Christ to the fullest extent when it defines dogmas, that is, when it proposes, in a form obliging the Christian people to an irrevocable adherence of faith, truths contained in divine Revelation or also when it proposes, in a definitive way, truths having a necessary connection with these.
89 There is an organic connection between our spiritual life and the dogmas. Dogmas are lights along the path of faith; they illuminate it and make it secure. Conversely, if our life is upright, our intellect and heart will be open to welcome the light shed by the dogmas of faith.50
90 The mutual connections between dogmas, and their coherence, can be found in the whole of the Revelation of the mystery of Christ.51 “In Catholic doctrine there exists an order or hierarchy of truths, since they vary in their relation to the foundation of the Christian faith.”52
Five reasons stand out as to why all Christians should support the magisterium.
1) Its authority is excersised in the name of Jesus Christ.
2) It is based on a communion that includes the bishops and the bishop of Rome, the pope.
3) The Magisterium is a servant of the word of God.
4) It will always contain the truths of Divine Revelation.
5) It is doctrinal and dogmatic, not political.
God is good.
JMJ, pray for us.