Books are totally useless unless you take their advice. If you just keep reading them, thinking "that's so insightful! that changes everything," but never actually doing anything different, then pretty quickly the feeling will wear off and you'll start searching for another book to fill the void.
To buy books would be a good thing if we could also buy the time to read them; but the purchase of books is often mistaken for the assimilation and mastering of their contents.