It basically means that the choice of books that a person makes reflects his thoughts and ideas . For example, it is a common observation that people having interest in fiction and novels have such mind that they often think their normal lives to be fictitious and take it as a play , people studying books on spiritualism usually have a distance from other people and when you would talk with a person whose reading choice is known to you , you would find his ideas and words to be similar to those books . This is a brief illustration of this quotation .
