There are three infallible ways of pleasing an author,
and the three form a rising scale of compliment:
1, to tell him you have read one of his books;
2, to tell him you have read all of his books;
3, to ask him to let you read the manuscript
of his forthcoming book.
No. 1 admits you to his respect;
No. 2 admits you to his admiration;
No. 3 carries you clear into his heart.
— Mark Twain, “Pudd’nhead Wilson’s Calendar”