Our beliefs are important to us. But what does that mean?
When you think of something, you hope it's worth thinking about.
Because why try to think at all if you cannot potentially avoid some foolish effort.
So when a thought occurs that is something worth thinking about, you'll feel it because it's partially the consequence of your underlying aims and values.
Because you can't think long enough in one direction without having an aim and value orienting you towards it.
If you're fortunate in that a belief has given you any real value, you'll start to form an understanding around it.
And because that understanding is derived from a thought worth developing, at least once upon a time in your past, it's a reflection of the value structure you once oriented yourself with.
So when you go about operating in the world and inevitably you come across something that you don't understand, that you thought you did, it more than reveals that your model of the world wasn't just factually incorrect, it says your aims and value system guided you into unmapped territory.
And when you don't know where you are, that can be just devastating.