One thing I think is, like skills, even belief is built on top of beliefs. I mean when we are very young we develop very simple beliefs. Dad is strong. Mom is smart. Brother is a bully. etc etc. And when we grow up, we pick more beliefs. The simpler ones mostly provide us the ground to make slightly complex beliefs, and so on.
Also some times we pick beliefs from leaderships, heroes, and inspirational people. For examples some of them come from our parents. Some our teachers/authors who we like and beleive are knowledgeable.
I did not read this anywhere, I just think that is how it works
Let me know what you think