There are certain categories of books that you can read once and never return to—you read a single title on that subject and it tells you all you ever need to know about it. But there are other categories of books that you need to return to on a regular basis. In my experience, that includes books on giving—on living a life marked by financial generosity. Over time I find my natural tendency is toward keeping rather than giving, toward saving rather than freely distributing. So I need to regularly read books that will interrupt my apathy and reaffirm what I know to be good and true.