http://www.traditionalmass.org/images/articles/BaptDes-Proofed.pdf

I. You must believe the teachings of both the solemn and the universal ordinary magisterium of the Church (Vatican I).

A. General Principle:

• “Further, by divine and Catholic faith, all those things must be believed  which  are  contained  in  the  written  word  of  God  and  in tradition, and those which are proposed  by the Church, either in a
solemn pronouncement or IN HER ORDINARY AND UNIVERSAL TEACHING POWER [magisterium], to be believed as divinely revealed.” Vatcan Council I, Dogmatic Constitution on the Faith (1870), DZ 1792.

B. The  Code  of  Canon  Law  imposes  the  same  obligation. (Canon 1323.1)

C. Therefore,  you  must  believe  by  divine  and  Catholic  faith those things:

1. Contained in Scripture or Tradition,  AND

2. Proposed  for  belief  as divinely  revealed  by  the  Church’s authority, either through:

a. Solemn pronouncements (by ecuмenical councils, or popes ex cathedra) OR

b. Universal  ordinary  magisterium (teaching  of  the bishops  together  with  the  pope,  either  in  council,  or spread through out the world.)

D. This is not “optional,” or “a matter of opinion.”

• It defines the object of faith — what you are  obliged  to believe.

• Further,  it  is de  fide  definita an infallible,  unchangeable, solemn pronouncement.

II. You must believe those teachings of the universal ordinary magisterium  held  by  theologians  to  belong  to  the  faith (Pius IX).

• “For even if it were a matter concerning that subjection which is to be manifested by an act of divine faith, nevertheless, it would not have to be limited  to those matters which have been defined by express  decrees  of  the  ecuмenical  Councils,  or  of  the  Roman  Pontiffs  and  of  this  See,  but  would  have  to  be extended  also  to  those matters which are handed down as divinely revealed by the ordinary teaching power of the whole Church  spread throughout the world, and therefore, by universal and common  consent are held by  Catholic  theologians  to  belong  to  faith.” Tuas  Libenter (1863), DZ 1683.

III. You  must  also  subject  yourself  to  the  Holy  See’s  doctrinal decisions  and to other forms of doctrine commonly held as theological truths and conclusions. (Pius IX).

A. General Principle.

• “But,  since  it  is  a  matter  of  that  subjection  by  which  in  conscience  all  those  Catholics  are  bound  who  work  in  the  speculative sciences,  in order that they may bring new advantage to the Church by their writings, on that account,  then, the men of that same convention should realize that it is not sufficient for learned Catholics to accept and revere the aforesaid dogmas of the Church, but that it is also necessary to subject themselves to the decisions pertaining to  doctrine  which  are  issued  by  the  Pontifical  Congregations,  and also to those forms of doctrine which are held by the common and constant  consent  of  Catholics  as theological  truths  and  conclusions, so  certain  that  opinions  opposed  to  these  same  forms  of doctrine,  although  they  cannot be  called  heretical,  nevertheless deserve some theological censure.” Tuas Libenter (1863), DZ 1684

B. You must therefore adhere to the following:

1. Doctrinal decisions of Vatican Congregations  (e.g., the Holy Office).

2. Forms of doctrine held as:

a. Theological truths and conclusions.

b. So  certain  that  opposition  merits  some  theological censure short of “heresy.

IV. You must reject these condemned positions on this issue:

A. Theologians  have  “obscured”  the  more  important  truths  of our faith. (Condemned by Pius VI.)

• “The  proposition  which  asserts  ‘that  in  these  later  times  there has  been  spread  a  general  obscuring  of  the  more  important  truths pertaining to religion, which are the basis of faith and of the moral teachings  of  Jesus  Christ,’ HERETICAL .” Auctorem  Fidei (1794)  DZ 1501.

B. Catholics are obliged to believe only those matters infallibly proposed as dogmas. (Condemned by Pius IX.)

• “And  so  all  and  each  evil  opinion  and  doctrine  individually mentioned in this letter, by Our Apostolic authority We reject, proscribe, and condemn: and We wish and command that they be considered as absolutely rejected, proscribed and condemned by all the sons of the Catholic Church...”

“22. The obligation by which Catholic teachers and writers are absolutely bound is restricted to those matters only which are proposed  by the infallible judgement  of  the Church, to  be  believed by all  as  dogmas  of  the  faith.” CONDEMNED PROPOSITION. Encyclical Quanta Cura and Syllabus of Errors (1864), DZ 1699, 1722.

C. Encyclicals do not demand assent, because popes are not exercising their supreme power. (Condemned by Pius XII.)

• “It is not to be thought that what is set down in Encyclical Letters does not demand assent in itself, because in these the popes do not  exercise  the  supreme  powers  of  their magisterium. For  these matters  are  taught  by  the  ordinary magisterium, regarding  which the  following  is  pertinent  ‘He  who  heareth you,  heareth  me.’;  and usually  what  is  set  forth  and  inculcated  in  Encyclical  Letters,  already  pertains  to  Catholic  doctrine.” Humani  Generis (1950),  DZ 2313.