Doris Lessing, quoted by Pamela Paul, My Life with Bob
As much as I have enjoyed reviewing books over the past 45 years, the downside has always been this feeling of compulsion that goes with it. There is nothing legally binding here, and in most cases I have had some choice in which books I read and review. Even so, if I am sent a new book by a publisher, it should still be new when I read it. I can't very well wait five years until the time feels right for me to tackle this particular subject, author or whatever.
Members of book clubs may face an even stronger compulsion. If their club decides to discuss a certain book at next month's meeting, that is the book members should read. Never mind that they are in the mood for something lighter or darker or perhaps don't feel like reading anything at all.
The right time for the right book is not merely a question of mood. It is also a question of stage of life. As much as I loved The Catcher in the Rye when I was a teenager, I have always been reluctant to return to it for fear my older self would not find the same depth of meaning I found there in my youth. There have been other books, most notably Jules Verne's Journey to the Center of the Earth, that later lacked whatever magic they possessed when I was young. There are other books that may be meaningless to us in our youth but will be packed with significance when we read them later in our lives.
Books do have their time and place. We are blessed when we have the freedom to make that choice ourselves.