You do not have a mind belongs to yourself! Your thoughts are the thoughts of your culture! When you speak, it is not you but your culture, your religion, your traditions, your political or spiritual...
Never trust books on the question of whether or not to trust your rational thinking. Trust your rational thinking on the question of whether or not to trust the books.
When you are imprisoned by the rules of conformity, it tames your imaginative capacity and steals your free thinking abilities.