Some people gain new insight from books to better grasp their own evolution. Different interpretations of consciousness, memory, and dreams for example, can help me to better stand back and grasp abstract concepts. That doesn't mean I take the views of otehr people at face value. I don't always think words adequately describe how I feel and what I experience.
As it is, we all create a personal understanding of existence, heaven, hell, meditation or whatever experience may be our present focus. We also add our own slant, whether we think some thought or action is good or bad. Our own value judgments are often shaped by external influences. How do you know when your feeling is solely your own?