When a doctrine is declared to be infallible, there are two practical consequences. First, the teaching can't be changed by future generations. Second, Catholic theologians and teachers can be disciplined for challenging the doctrine.
In an earlier post I mentioned that only some teachings of ecumenical councils and Popes are infallible. "Infallible" means that the teaching can never be contradicted. That includes a pretty short list of teachings, most of which come from councils--the Popes have made only 2 infallible statements in history.
Then there's the "ordinary magisterium." That includes everything that hasn't been infallibly taught. The best analogy for the ordinary magisterium is a Supreme Court decision--a later court can reverse the decision, but while it stands it's the law.
This is where things get interesting.
If something is taught by the ordinary magisterium long enough and consistently enough, then it can be infallible. However, there's no definitive way to determine when this happens. People who want to limit debate on controversial issues will make long lists; people who want to encourage debate will make short lists. But none of these lists really matter
Every so often, a Pope will say that a teaching is infallible through the ordinary magisterium. This has the effect of cutting off debate on the topic, but it doesn't limit future generations.
This is what happened with women's ordination. If Pope John Paul II had made an infallible statement that women couldn't be ordained, it would have been binding on the church for all time. Instead, he said that it was an infallible statement of the ordinary magisterium. This means that Catholic teachers can't advocate women's ordination. However, another Pope could come along and say that JPII's opinion was wrong, which would allow for debate to resume.
Finally, even if a teaching isn't infallible, church authorities can tell the people they're responsible for to stop arguing about it. For example, JPII declared that the death penalty was wrong in modern society. Everyone recognizes that this is a recent teaching and not infallible. But if a priest spoke in favor of the death penalty, his bishop could order him to stop.
I hope this explanation is clarifying, not confusing.
Alan
You are great in explaining....
I would add that some people have the wrong idea that the infallible dogmas are "magic sentences": that is not.
What is infallibly is not the letter of the dogma, but the fact described.
And because we cannot describe with precision any aspect of God (not at all), this shall be always considered.
But to state any dogma in a rational way you need following ingredients:
- the fact to be described (the only infallible think)
- a language/philosophy used to describe it
- whichever is not explicitally stated but given as known.
So if you use the Latin language and a neo-aristotelic philosophy, the best was to describe the Eucharistic fact is the word
transubstatation (it is simply a word, not an explanation)
If you use the Greek with a neo-platonic philosophy the dogma of the transubstatation shall be stated using different ways.
Who use modern English, and dont use the term
substantia everyday when shopping, surely need that the
transubstatation is rewritten: not to change the fact, but the way to describe it
PS for mrconstance: about the women-ordination, most catholic theologicians think it is a extraordinary magisterium statment, and so not modificable