Whenever the bishops in union with the Pope, in a council, teach or proclaim a matter of faith and/or morals, which must be definitively held, these teachings are infallible. Ecumenical Councils
3. The Pope and a council can only declare something infallible because they are true, and the Church has always believed them. They introduce no new teaching, no new doctrine.
The Teaching office of the Church is exercised in two ways: Ordinary and Extraordinary
a) Pope Speaks Ex-Cathedra
b) Ecumenical Council (21 Councils)
a) Encyclicals – letters by the Pope
b) Statements from Synods– gathering of priests, bishops, and theologians for discussion and decision of matters relating to faith, morals, and discipline
c) Individual instruction from Bishops to the faithful in their diocese.
2. This authority is also exercised in matters of discipline.
a) Fasting on Ash Wed. / Good Fri.
b) Fasting one hour before communion
c) Holy Days of Obligation
* thus they can be changed