After all, when you come right down to it, how many people speak the same language even when they speak the same language?
Who can know anybody?' said the bookshop owner. 'Every person is like thousands of books. New, reprinting, in stock, out of stock, fiction, non-fiction, poetry, rubbish. The lot. Different every day. One's lucky to be able to put his hand on the one that's wanted, let alone know it.