Could you please explain this concept to me? I looked it up in the Catechism, but I don’t really understand it. Could you simplify it for me please?
First of all, I think it is safe to say that everyone has difficulty understanding this. After all, it is a divine mystery, so only God can fully understand it. Nevertheless, we are able to comprehend aspects of divine mysteries at least on some level, so I will take a shot at it.
Imagine the following situation. And my example will sound a bit silly, but please don’t think that I am not taking your question seriously. Silliness just happens to be part of my nature.
A (Fictional) Story About Rose Windows:
Let’s say that you are a church architect. And let’s say that God likes church buildings to have rose windows. So the Holy Spirit inspires you to put rose windows in the churches you design. You never received a visit from the Archangel Gabriel telling you to do this, and you never came across a Bible verse directing you in this way either. Rather, deep down in your heart, you simply had an intuitive sense that God wants rose windows in churches. Of course, you are not the pope or a bishop, and you as an individual can lay no claim that what you feel about rose windows is clearly a manifestation of the will of God. After all, you could be right or you could be wrong. For all you know, maybe you have a psychological predisposition towards rose windows.
Later you attend the National Convention of Church Architects and discover that all the other architects also have a deep-seated belief that God wants rose windows in churches! At first you thought it was just something that you experienced, and you were willing to admit that you could be mistaken. But what does it look like now? It looks like that it certainly could be not only the working of the Holy Spirit, but the working of the Holy Spirit on a grand scale!
Plus the caterers at the convention admit that they, too, have this deep-seated belief about rose windows, as does the janitor of the building, the news reporters covering the event, and other people who aren’t architects! Well, it certainly seems like we could start calling this the theological Doctrine of the Rose Window. But you and everyone else exercises wisdom and prudence, and wait for the Church authorities to provide some guidance.
Along those lines, the pope and bishops (i.e., the Magisterium) witness this phenomenon and likewise admit that they, too, have this feeling about rose windows. They declare it, therefore, to be a manifestation of God’s divine will. Through a very mysterious and mystical way, God has brought all his people into the realization that he wants rose windows in churches, and yet no one individual can actually put his finger on exactly where and how God planted this idea into his heart & mind. Everyone just kind of “knew”, and they knew it all along. This way of all the members of the Church intuitively knowing a certain aspect of divine revelation is an example of Sensus Fidei. My rose window example has a major flaw, though, which I will point out in a moment.
Connection Between Sensus Fidei and the Deposit of Faith:
Sensus fidei is one of the ways God gives revelation intended for the whole church. Because it is considered “public revelation”, it must be rooted in the Deposit of the Faith (i.e., the teachings of the Faith handed on to us from the time of the Apostles). I say this because the Church does not expect any new public revelation beyond that (at least not until the Second Coming).
The Actual Definition of Sensus Fidei:
Keeping my example in mind, let us now read the definition of Sensus Fidei from the glossary of the Catechism, and hopefully it will now make better sense (or better “sensus” as the case may be – lol) :
“A supernatural appreciation of the faith (sensus fidei) shown by universal consent in matters of faith and morals manifested by the whole body of the faithful under the guidance of the Magisterium.”
Of course, my example really had nothing to do with “faith and morals”, which is one of the reasons it’s a bit silly (and this was the major flaw I mentioned above), but I hope you get my meaning.
A Clarification of the Role of the Magisterium:
Unlike in my example, the Magisterium does not have to make an official declaration about every belief associated with Sensus Fidei. As Benadam pointed out, the Church’s teachings about the Immaculate Conception were embraced by Christians for centuries before it was declared to be an official doctrine. But, as my example and the glossary points out, any understanding of Sensus Fidei needs to be done under the guidance of the Magisterium (and such guidance does not necessarily have to come under the form of an official declaration). After all, there are Catholics who try to abuse the general concept in order to get around certain Church teachings on morality (their argument being that if enough Catholics are disobeying the teaching then it must be the Holy Spirit using Sensus Fidei to tell them it’s ok - obviously the whole thing about Sensus Fidei being rooted in the Deposit of Faith is lost on them). In such a case, this belief of a certain group of people is clearly not under the guidance of the Magisterium.
And One Last Comment:
If this thread now goes off-topic into a discussion on whether or not church buildings ought to have rose windows, I apologize in advance.