To have read ...

... or not to have read: Huckleberry Who? (Hat tip, Dave Lull.)

Not a good idea to teach or write about a book you haven't read all the way through. Which may mean re-reading one you read a long while ago. (I didn't have that problem when I wrote about J.B. Priestley's Literature and Western Man recently because I've re-read so many parts of it so often.)