One of the more interesting points in this (in my opinion) is that it is people with overtly confident personalities that tend to become more zealous. "Meek" personalities tend to become "paranoid, credulous, and superstitious."
I think these kinds of things make sense because they seem to relate to the psychological idea of locus of control: Internal being I have control of my world, while External is I have no control over my world. If I have no control, I'll probably be meeker and more paranoid.
What do you think?