Interesting Allegory

While reclining on Contemplation Point I reflected on comments made to me regarding one's library.  The comment was that one's library is only so large and has a finite capacity.  When one's library is full and a new book is introduced then an old book must be taken from the shelves.  If one is happy with their library must they stop acquiring new books?  If a new book is acquired which old book should be discarded?  Is this an allegory for life?