If the verifiable evidence cannot fit with my own internal standard of the universe then I have no other choice but to reject it. IE I have no choice.
If the verifiable evidence fits with my own internal standard of the universe then I have no other choice but to accept it. IE I have no choice.
It's more than just seeing is believing.
You have verifiable evidence the sky is colorless.
How you process evidence using your own internal standard to create an apparent truth (an involuntary action) determine wither you accept it or reject it as a belief.
Fixed
The internal standards can change and as Kirby said you have the choice to challenge your belief but you can't choose what you believe. And even then if said challenge changes the belief you still have no choice, I can never go back to believing the "sky is blue" even if I wanted to. I have no choice.