I have recently learned that beliefs and ideas are the exact same thing and that it is the way we choose to use them that differentiates them.
A belief/idea will be fixed or flexible depending on what we choose it to be.
Once we have a belief/idea, its very difficult to change or get rid of... only if we choose to hold on to it so tightly.
I do actually agree with you and i understand what you mean though. i choose to let my beliefs/ideas evolve and to be forever changing, always flexible, never fixed, i am always ready to let them go if they are proved wrong.