The question of whether or not there is a God or truth or reality, or whatever you like to call it, can never be answered by books, by priests, philosophers or saviours. Nobody and nothing can answer the question but you yourself and that is why you must know yourself. Immaturity lies only in total ignorance of self. To understand yourself is the beginning of wisdom.
Source: http://www.jkrishnamurti.org/krishnamurti-teachings/view-text.php?tid=48&chid=56784