I don't think a person who goes thru life employing reason can ever really 'choose' what to believe.
I observe the sky to be blue, the grass to be green. Is there any real 'choice' concerning these observations? What I believe has been dictated to me by empirical evidence. My choice in believeing the opposite is gone.
In the end, once we start choosing what to believe, we have esentially abandoned reason. The reasoning mind is compelled by evidence.