Jeffrey Lloyd posted this explanation by David Currie explaining the distinctions between Deposit of Faith, Dogma, Doctrine, Discipline, Devotion etc.
My question is: What is the Catechism? I assume it is some mixture of dogma and doctrine - is there any way we can know the difference on certain teachings? Whether they are dogma or doctrine, or discipline or devotions?
First is the Deposit, the Tradition and the Scriptures left to us by the Apostles. This is considered infallible and unalterable.
Next comes Dogma, meaning some point of faith that's so important that the Holy Spirit led a Council---or once or twice, a Pope---to declare it infallible and unalterable. Dogmas include things like the Trinity, the Hypostatic Nature of Christ, the Assumption of Mary, and whatnot.
Then comes Doctrine, which is important but not infallible, and it can be altered if a better understanding comes along. A classic example of this would be Limbo.
Then we have Discipline, like not eating meat on Fridays and celibacy, which can be imposed by the Church, and can be lifted by the Church. Not infallible, not unalterable.
And last, the bottom rung: Devotion. This is what the individual catholic decides to do insofar as prayers, meditations, and so on goes. Not infallible by any stretch, and certainly not unalterable. Tellingly, this includes 99.999999999% of all Marian activity, from Rosaries to novenas to Our Lady of Lourdes. You don't even have to believe in this stuff, and you can still be a good and faithful Catholic.
My question is: What is the Catechism? I assume it is some mixture of dogma and doctrine - is there any way we can know the difference on certain teachings? Whether they are dogma or doctrine, or discipline or devotions?
