my article on the heresy of magisterium-ism is here:
There are three sources of truth, from Divine Revelation, in the Catholic Faith: Sacred Tradition, Sacred Scripture, and the Magisterium.
“Sacred tradition and Sacred Scripture form one sacred deposit of the word of God, committed to the Church.” (Dei Verbum, n. 10).
“This magisterium is not above the divine word but serves it with a specific carisma veritatis certum, which includes the charism of infallibility, present not only in the solemn definitions of the Roman Pontiff and of Ecumenical Councils, but also in the universal ordinary magisterium, which can truly be considered as the usual expression of the Church’s infallibility…. With respect to the non-infallible expressions of the authentic magisterium of the Church, these should be received with religious submission of mind and will.” (Pope John Paul II, Address of 15 October 1988).
The Magisterium has the task of teaching from and interpreting the Sacred Deposit of Faith (Tradition and Scripture ). These three sources of truth are analogous to the Most Holy Trinity: they are three-yet-one, and they are co-equal.
The fundamental error in the heresy of magisteriumism is to exalt the Magisterium to the detriment of Sacred Tradition and Sacred Scripture; the Catholic Faith is then treated as if it were based only on the Magisterium. Similarly, the heresy of sola Scriptura treats the Faith as if it were based only on Scripture, denying Tradition and Magisterium. Likewise, the ultra-traditionalist heretics make the error of exalting Tradition (i.e. their own misinterpretation of Tradition), over Scripture and Magisterium; whenever the Magisterium teaches on any point of faith or morals, they reject that teaching if it does not agree with their own limited understanding and misunderstanding of Tradition.
There are several commonly found errors among those who hold to this heresy:
1. The idea that the Magisterium is above Tradition and Scripture.
2. The idea that the Magisterium is above reproach or correction by the faithful.
3. The idea that the faithful can only learn the truths of the Faith from the Magisterium, not from Tradition or Scripture directly.
4. The idea that the teaching of the Church is nothing other than the teachings of the Magisterium.
5. The idea that the teachings of the Faith flow in one direction, from the Magisterium to the faithful.
6. The idea that development of doctrine is solely the work of the Bishops and the Pope, never the faithful.
7. The idea that the Magisterium is the Pope and the Bishops.
8. The idea that whenever the Pope and the Bishops act authoritatively, they exercise the authority of the Magisterium.
9. The idea that the teachings of the Magisterium are all explicitly taught in written documents.
10. The idea that the teachings of the Church are all found in the written documents of the Magisterium.
11. The idea that all of the teachings of the Church can be understood by the faithful.
12. The idea that any teaching of the Church can be found the internet or in the Catechism.
13. The idea that the teachings of the Church are separate from and above the teachings of the Saints, Doctors, Fathers, priests, theologians, and ordinary Catholics.
14. The idea that the Faith is not based at all on the private interpretation of Scripture by the faithful.
15. The idea that the Magisterium can teach other truths, which are outside of Tradition and Scripture.
16. The idea that everything taught by the Magisterium is true.
17. The idea that any dissent from what the Pope or Bishops teach is sinful unfaithful dissent.
18. The idea that any disobedience to what the Pope or Bishops decide is sinful unfaithful disobedience.
19. The idea that those loyal to the Magisterium should only believe what the Magisterium teaches, not their own interpretation or opinion.
20. The idea that the all the truths of the Faith can be known by those who are loyal to the Magisterium.
21. The idea that the Church on earth consists of the faithful following the Magisterium