Of all the knowledge we have, some comes from the books we read, some comes from personal experience in our lives. Different people attach different importance to different sources. The young and the educated, for example, may emphasize the former, the old may, however stress the latter. In my opinion, both book knowledge and personal experience are of equal importance.
Knowledge gained from experience may be firsthand, direct, and unforgettable. Books in the library may be outdated, giving you useless information.