If you were isolated, for example locked in a prison cell, and were allowed to read only one book, as many times as you wanted to, which would it be? Mostly inspired from a nice short story by Anton Chekhov i re-read a couple of weeks ago, where the main character is reading loads of books for one whole year, in a prison cell where he agreed to be isolated for two years, but then only the bible in the next year (the story is called The Bet). Of course reading only one book would not negate the ability to reflect on it multiple times, in different ways. Also it is supposed that you have your memory of all other books you read. You can either choose to take a book you have already read, or one you have not. You can take "the complete works" of someone, as long as they are just one tome (for example Wordsworth has a single tome of all of Dickens' shorter novels). As for me i would take Kafka's diary, which i read, read again, and again for a decade, but i think it is the one book which would enable me to continue infinite self-reflections, due to the depth it assumes for me.