Books make great gifts because they have whole worlds inside of them. And it's much cheaper to buy somebody a book than it is to buy them the whole world!
That's the whole point of good propaganda. You want to create a slogan that nobody's going to be against, and everybody's going to be for. Nobody knows what it means, because it doesn't mean anything.
What refuge is there for the victim who is oppressed with the feeling that there are a thousand new books he ought to read, while life is only long enough for him to attempt to read a hundred?